Question: Who tried for second degree murder from an incident that happened at The Retreat at Twin Lakes?

Context paragraphs:
George Zimmerman: George Michael Zimmerman (born October 5, 1983) is an American known for the fatal shooting of Trayvon Martin on February 26, 2012, in Sanford, Florida.  On July 13, 2013, he was acquitted of second-degree murder in "Florida v. George Zimmerman".  s of 2015 , he remained the subject of media interest due to ongoing controversy over the Trayvon Martin case.  In addition, he has been involved in other violent incidents, with allegations of violence made against him since he was acquitted of murder.

Twin Lakes Beach, Manitoba: Twin Lakes Beach (French: Plage Twin Lakes), also known locally by many as simply "Twin Beaches," is a beach / community located in the Canadian province of Manitoba, on Lake Manitoba.  It is about 100 km north-west of the provincial capital Winnipeg.  Twin Lakes Beach is located in both the Rural Municipality of St. Laurent (French: la Municipalité Rurale de Saint-Laurent) and the Rural Municipality of Woodlands, and is near the town of St. Laurent.

California Proposition 7 (1978): California Proposition 7, or the Death Penalty Act, is a ballot proposition approved in California by statewide ballot on November 7, 1978.  Proposition 7 increased the penalties for first degree murder and second degree murder, expanded the list of special circumstances requiring a death sentence or life imprisonment without the possibility of parole, and revised existing law relating to mitigating or aggravating circumstances.

Scott Peterson: Scott Lee Peterson (born October 24, 1972) is an American former fertilizer salesman awaiting execution on death row in San Quentin State Prison, convicted of the first degree murder of his pregnant wife, Laci Peterson, and the second degree murder of their unborn son, Connor, in Modesto, California in 2002.  He was sentenced to death by lethal injection the following year.  His case is currently on appeal to the Supreme Court of California.

R v Nette: R v Nette, [2001] 3 S.C.R. 488, 2001 SCC 78, is a Supreme Court of Canada decision on the standard for causation in criminal offences.  The Court upheld the "Smithers test" for causation in a criminal charge for manslaughter or murder but held that the test for causation for second degree murder need not be expressed as "a contributing cause of death, outside the de minimis range".  Instead, it would be more preferable to use positive terms such as "significant contributing cause".  In the case of first degree murder under s. 231(5) of the Code (crime of domination), a jury must also consider the additional "R v Harbottle" "a substantial causation" standard but only after finding the accused guilty of murder.

Twin Lakes (Madison County, Montana): Twin Lakes are a pair of small sub-alpine lakes in the Axolotl Lakes group in the Greenhorn Range southwest of Ennis, Montana.  Lower Twin Lakes is approximately 11 acre .  Upper Twin Lakes is considerably smaller and located approximately .25 mi southwest of the lower lake.  Twin Lakes is located on state owned land and accessible by a one-lane dirt road (Axolotl Lakes Road) connecting Montana Highway 287 and the Gravelly Range road.

Twin Lakes Secondary School: Twin Lakes Secondary School is a secondary school located in Orillia, Ontario.  In March, 2008, a review process began to consolidate Orillia's three public high schools into two buildings as a result of cost of maintenance of the aging buildings and the declining enrollment at Park Street Collegiate Institute.  As of 2013, Twin Lakes is now one of the two remaining public high schools.  Twin Lakes administrative staff include Principal Julie Underhill and vice principals Jaclyn Calder and Mark Harvey.

Interlaken Resort District: Interlaken Resort District is located near Twin Lakes, Colorado and was one of the most scenic and most popular resort areas in the mountains of Colorado, in the United States.  Located across from the town of Twin Lakes, it began operations in 1879 as a small and unpretentious hotel called the Lakeside Resort on the smaller of the two lakes at the foot of Mt. Elbert.  In the 1950s the Twin Lakes were enlarged and Interlaken was cut off from the town and only accessible by boat.  The hotel closed shortly after the lake was enlarged.

Murder (United States law): In the United States, the law regarding murder varies by jurisdiction.  In most U.S. jurisdictions there is a hierarchy of acts, known collectively as homicide, of which "first degree murder" and "felony murder" are the most serious, followed by "second degree murder", followed by "voluntary manslaughter" and involuntary manslaughter which are less serious, and ending finally in "justifiable homicide", which is not a crime at all.  However, because there are at least 52 relevant jurisdictions, each with its own criminal code, this is a considerable simplification.

The Retreat at Twin Lakes: The Retreat at Twin Lakes is a gated community in the US city of Sanford, Florida that gained notoriety following the February 2012 shooting of Trayvon Martin by George Zimmerman.  The community initially consisted of 1,400-square-foot (130 m²) townhouses which sold on average for $250,000, but had values below $100,000 by February 2012 due in large part to the financial crisis of 2007–2008.  In 2013, properties ranged from "$115,990s–$126,990s."

Supporting paragraphs: The Retreat at Twin Lakes George Zimmerman
Answer: George Zimmerman