Question: The "Deepwater Horizon" oil spill for which Peter V. Neffenger was the Deputy Nation Incident Commander, killed how many people in total?

Context paragraphs:
Deepwater Horizon oil spill: The "Deepwater Horizon" oil spill (also referred to as the BP oil spill, the BP oil disaster, the Gulf of Mexico oil spill, and the Macondo blowout) began on April 20, 2010, in the Gulf of Mexico on the BP-operated Macondo Prospect.  Killing eleven people, it is considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8% to 31% larger in volume than the previous largest, the Ixtoc I oil spill.  The US Government estimated the total discharge at 4.9 Moilbbl .  After several failed efforts to contain the flow, the well was declared sealed on September 19, 2010.  Reports in early 2012 indicated that the well site was still leaking.

Timeline of the Deepwater Horizon oil spill: The following is a timeline of the "Deepwater Horizon" oil spill (also referred to as the BP oil spill, the Gulf of Mexico oil spill or the Macondo blowout).  It was a massive oil spill in the Gulf of Mexico, the largest offshore spill in U.S. history.  It was a result of the well blowout that began with the "Deepwater Horizon" drilling rig explosion on April 20, 2010.

Peter V. Neffenger: Peter V. Neffenger (born 1955) was the Administrator of the Transportation Security Administration from July 2015 till his statutorily required resignation on January 20, 2017 upon Donald Trump becoming President.  Previously to leading TSA, Neffenger was a Vice Admiral in the United States Coast Guard, serving as Vice Commandant of the United States Coast Guard since May 20, 2014.  He previously had served as Deputy Commandant for Operations, Deputy National Incident Commander for the 2010 "Deepwater Horizon" oil spill, Director of Coast Guard Strategic Management and Doctrine, Commander of the Ninth Coast Guard District, Commander of Coast Guard Sector Los Angeles - Long Beach, Captain of the Port and Federal Maritime Security Coordinator, Budget Officer of the Coast Guard, and Coast Guard Liaison Officer to the Territory of American Samoa.  On April 28, 2015, he was nominated by President Barack Obama to be the administrator of the Transportation Security Administration.

Deepwater Horizon explosion: The "Deepwater Horizon" drilling rig explosion was the April 20, 2010, explosion and subsequent fire on the "Deepwater Horizon" semi-submersible Mobile Offshore Drilling Unit (MODU), which was owned and operated by Transocean and drilling for BP in the Macondo Prospect oil field about 40 mi southeast off the Louisiana coast.  The explosion and subsequent fire resulted in the sinking of the "Deepwater Horizon" and the deaths of 11 workers; 17 others were injured.  The same blowout that caused the explosion also caused a massive offshore oil spill in the Gulf of Mexico, considered the largest accidental marine oil spill in the world, and the largest environmental disaster in U.S. history.

Keiana Cavé: Keiana Cavé is an American Entrepreneur.  She is also a student at the University of Michigan studying chemical engineering.  She was honored in the Forbes 30 Under 30 Class of 2017 in the "Energy and Cleantech" Category.  Keiana is one of the youngest changemakers to be featured on the list.  She is originally from New Orleans, Louisiana.  Keiana began her own independent research on the BP Deepwater Horizon Oil Spill with a focus on nanotechnology at the University of New Orleans at 15.  Now, she has two published scientific research papers and two patents.  After placing second at Intel ISEF in the Earth and Environmental Sciences category for her project, “A Method for Identifying the Photoproducts, Mechanisms, and Toxicity of Petroleum from the Deepwater Horizon by High-Performance Liquid Chromatography and DNPHi Derivatization,” Keiana became a member of Tulane University's Van Bael Lab where she continued her oil spill research with a focus on bacterial and fungal endophytes.

Deepwater Horizon Oil Spill Trust: The "Deepwater Horizon" Oil Spill Trust is the $20 billion trust fund established by BP to settle claims arising from the "Deepwater Horizon" oil spill.  The fund was established to be used for natural resource damages, state and local response costs and individual compensation.  It was established as Gulf Coast Claims Facility (GCCF), announced on 16 June 2010 after meeting of BP executives with U.S. President Barack Obama.  In June 2012, the settlement of claims through the GCCF was replaced by the court supervised settlement program.

Gulf killifish: The Gulf killifish, "Fundulus grandis", is one of the largest members of the genus "Fundulus"; it is capable of growing up to 18 cm in length, whereas the majority of other "Fundulus" reach a maximum length of 10 cm.  Therefore, "F. grandis" is among the largest minnows preyed upon by many sport fish, such as flounder, speckled trout, and red snapper.  "Fundulus" derives from the Latin meaning "bottom," and "grandis" means "large".  The Gulf killifish is native the Gulf of Mexico from Texas to Florida and the eastern coast of Florida to Cuba in the Atlantic Ocean.  Threats to the survival of the Gulf killifish include extreme changes in salinity, changes in temperatures, and toxic events such as the hypoxic dead zone in Louisiana and the Deepwater Horizon oil spill.  The Gulf killifish is currently being used to test the effects of oil and oil dispersants on the physiology of marine species affected by these substances.  This is significant to conservation biology, because with the continued extraction of oil and other natural resources from North American waters, it has become increasingly important to understand the risks and consequences in worst-case scenarios, such as the Deepwater Horizon oil spill, and the lasting effects on the marine ecosystem.

Efforts to stem the Deepwater Horizon oil spill: Efforts to stem the "Deepwater Horizon" oil spill were ongoing from the time that the "Deepwater Horizon" exploded on April 20, 2010 until the well was sealed by a cap on July 15, 2010.  Various species of dolphins and other mammals (61 casualties), birds (2,095 casualties), and the endangered sea turtles (467 casualties) have been killed either directly or indirectly by the oil spill.  The "Deepwater Horizon" spill has surpassed in volume the 1989 "Exxon Valdez" oil spill as the largest ever to originate in U.S.-controlled waters; it is comparable to the 1979 Ixtoc I oil spill in total volume released (Ixtoc discharged 140 e6USgal to 148 e6USgal ; as of mid-July 2010, Deepwater Horizon has spilled 90 e6USgal to 180 e6USgal ).

Darryl Willis: Darryl Keith Willis (born c. 1969) is an American geologist and publicist, currently Regional President of BP Angola.  He is head of Deepwater Horizon oil spill claims and public relations spokesperson for the Deepwater Horizon oil spill.

Deepwater Horizon investigation: The "Deepwater Horizon" investigation included several investigations and commissions, among others reports by National Incident Commander Thad Allen, United States Coast Guard, National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling, Bureau of Ocean Energy Management, Regulation and Enforcement, National Academy of Engineering, National Research Council, Government Accountability Office, National Oil Spill Commission, and Chemical Safety and Hazard Investigation Board.

Supporting paragraphs: Peter V. Neffenger Deepwater Horizon oil spill
Answer: eleven