Tyson Gay

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Tyson Gay, right, races against Christian Coleman in a heat of the first round of the men's 100 meters at the U.S. Track and Field Championships, Thursday, June 22, 2017, in Sacramento, Calif. Gay just missed qualifying for the next round, but Coleman finished first. Gay has been running with a heavy heart since his 15-year-old daughter was shot and killed in October 2016 outside a restaurant in Kentucky. (AP Photo/Rich Pedroncelli)

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Sprinter Tyson Gay adjusts the starting block before taking a practice run, Wednesday, June 21, 2017, in Sacramento, Calif. Gay will be competing in the 100 and 200 meter races at the USA Track and Field Championships that starts Thursday and runs through Sunday. (AP Photo/Rich Pedroncelli)

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FILE - In this May 3, 2014, file photo, Trinity Gay, a seventh-grader racing for her Scott County High School team, poses for a photo with her father, Tyson Gay, after she won the 100 meters and was part of the winning 4-by-100 and 4-by-200 relays at the meet in Georgetown, Ky. The heartache still weighs heavily on Tyson Gay. But he keeps sprinting in her memory. The 15-year-old daughter of the Olympic sprinter was shot and killed in October outside a restaurant in Lexington, Kentucky. "You never forget it. You try to think about the good times," Gay said as he prepares for the first round of the 100 meters Thursday night at U.S track and field championships. (Mark Maloney/Lexington Herald-Leader via AP, FIle)/Lexington Herald-Leader via AP)

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In this May 3, 2014, photo, Trinity Gay, a seventh-grader racing for her Scott County High School team, poses for a photo with her father Tyson Gay, after she won the 100 meters and was part of the winning 4-by-100 and 4-by-200 relays at the meet in Georgetown, Ky. The 15-year-old daughter of Olympic sprinter Tyson Gay was fatally shot in the neck, authorities and the athlete's agent said Sunday, Oct. 16, 2016, and police have arrested a man in connection with the shooting. (Mark Maloney/Lexington Herald-Leader via AP)

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FILE - In this Aug. 11, 2012, file photo, Tyson Gay celebrates after receiving the silver medal for the men's 4x100-meter race during the athletics competition in the Olympic Stadium at the 2012 Summer Olympics, London. Gay has accepted a one-year suspension and has returned the silver medal he won at the London Olympics after he tested positive for a prohibited substance, USADA announced Friday, May 2, 2014. (AP Photo/Matt Slocum, File)

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FILE - In this Aug. 11, 2012, file photo, Tyson Gay celebrates after receiving the silver medal for the men's 4x100-meter race during the athletics competition in the Olympic Stadium at the 2012 Summer Olympics, London. Gay has accepted a one-year suspension and has returned the silver medal he won at the London Olympics after he tested positive for a prohibited substance, USADA announced Friday, May 2, 2014. (AP Photo/Matt Slocum, File)

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FILE - In this Aug. 16, 2009 file photo, United States' Tyson Gay who placed second celebrates with the U.S. flag after the Men's 100m final during the World Athletics Championships in Berlin. Gay said Sunday, July 14, 2013 that he tested positive for a banned substance and that he will pull out of the world championships next month in Moscow. (AP Photo/Anja Niedringhaus, File)

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Tyson Gay, left, beats Justin Gatlin to the finish line in their heat in the senior men's 100-meter dash at the U.S. Championships athletics meet on Friday, June 21, 2013, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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A bottle lies on the track behind the starting blocks after being thrown from the crowd as, from left, Jamaica's Usain Bolt, United States' Justin Gatlin, Jamaica's Yohan Blake, United States' Tyson Gay and Jamaica's Asafa Powell compete in the men's 100-meter final the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug. 5, 2012. (AP Photo/Martin Meissner)