Question: Who lost his legs in a bombing on April 15, 2013?

Context articles: The Mrs. Carter Show World Tour
2000–01 UEFA Champions League knockout stage
Chick Davies (basketball)
Sunil Tripathi
Allison family
Jeff Bauman
Stronger (film)
Trial of Dzhokhar Tsarnaev
Martin Richard Foundation
Boston Marathon bombing

The Mrs. Carter Show World Tour was the fifth concert tour by American singer Beyoncé.
 Announced in February 2013 with initial dates in Europe and North America, the tour contained seven legs and 132 shows.
 It began in Belgrade, Serbia on April 15, 2013 and concluded in Lisbon, Portugal on March 27, 2014.
 Its title is a reference to her marriage with American rapper Shawn "Jay-Z" Carter, who made multiple guest appearances throughout the tour.
The knockout stage of the 2000–01 UEFA Champions League featured the eight teams that had finished in the top two of each of the four groups in the second group stage and lasted from 3 April to 23 May 2001.
 The knockout stage followed a simple, single-elimination format, with the ties in each round (except for the final) being played over two legs, with whichever team scored the most goals over the course of the two legs progressing to the next round.
 In the case of both teams scoring the same number of goals over the two legs, the winner would be determined by whichever team scored more goals in their away leg.
 If the teams could still not be separated, a period of extra time lasting 30 minutes (split into two 15-minute halves) would be played.
 If the scores were still level after extra time, the winner would be decided by a penalty shoot-out.
 As in every season of the competition, the final was played as a single match at a neutral venue, which in 2001 was the San Siro in Milan, Italy.
Charles Robinson "Chick" Davies (March 1900 – April 15, 1985) was an American basketball coach.
 He served as the head men's basketball coach at Duquesne University from 1924 to 1948, compiling a record of 314–106.
 Davies' teams played in one NCAA tournament and three National Invitation Tournaments.
 He led Duquesne to the 1940 NCAA Final Four as well as the 1940 NIT championship game, where the Dukes lost to Colorado.
 Davies was born in March 1900 in New Castle, Pennsylvania.
 He died on April 15, 1985, in Pittsburgh, Pennsylvania.
Sunil Tripathi was an American student who went missing on March 16, 2013.
 His disappearance received widespread media attention after he was wrongfully accused on social media as a suspect in the Boston Marathon bombing.
 Tripathi had been missing for a month prior to the April 15, 2013 bombings.
 His body was found on April 23, after the actual bombing suspects had been officially identified and apprehended.
Hudson Joshua Creighton Allison (December 9, 1881 – April 15, 1912), his wife, Bess Waldo Allison (née Daniels) (November 14, 1886 – April 15, 1912), their daughter Helen Loraine Allison (June 5, 1909 – April 15, 1912) and son, Hudson Trevor Allison (May 7, 1911 – August 7, 1929) were 1st class passengers on board the RMS "Titanic", which struck an iceberg and sank on April 15, 1912.
 Only Trevor survived.
Jeff Bauman Jr. is an American author.
 He lost his legs in the Boston Marathon bombing and was the subject of a famous photograph taken in the aftermath of the bombing.
 The 2017 film "Stronger" is based on a memoir of the same name he co-wrote, with Jake Gyllenhaal portraying him.
Stronger is a 2017 American biographical drama film directed by David Gordon Green and written by John Pollono, based on the memoir of the same name by Jeff Bauman and Bret Witter.
 It follows Bauman, who loses his legs in the Boston Marathon bombing and must adjust to his new life, and stars Jake Gyllenhaal as Bauman, with Tatiana Maslany, Miranda Richardson, and Clancy Brown in supporting roles.
The trial of Dzhokhar Tsarnaev for the Boston Marathon bombing on April 15, 2013, began on March 4, 2015, in front of the US District Court for the District of Massachusetts, nearly two years after the pre-trial hearings.
 Tsarnaev's attorney, Judy Clarke, opened by telling the jurors that her client and his older brother, Tamerlan, planted a bomb killing three and injuring hundreds, as well as murdering a MIT police officer days later.
 "There's little that occurred the week of April the 15th ... that we dispute," Clarke said in her 20-minute opening statement.
 Tsarnaev was found guilty on all 30 counts and has been sentenced to death by lethal injection for his crimes.
The Martin W. Richard Charitable Foundation is a 501(c)(3) tax-exempt charitable foundation established by the parents of Martin Richard, an 8-year-old boy who was killed in the Boston Marathon bombing on April 15, 2013.
 The foundation is dedicated to promoting education and sports in the community.
On April 15, 2013, two homemade bombs detonated 12 seconds and 210 yd apart at 2:49 p.m., near the finish line of the annual Boston Marathon, killing three people and injuring several hundred others, including 16 who lost limbs.