Terrence L. Thomas was shocked with a stun gun, but cocaine killed him, the medical examiner says. A man who died in police custody last month soon after officers shocked him with a Taser stun gun died of a cocaine overdose, not from the shock, the city medical examiner said yesterday. Investigators had said that the man, Terrence L. Thomas, 35, might have swallowed crack cocaine before detectives arrested him early on the morning of July 27. After his arrest, in a holding cell at the 105th Precinct station house, Mr. Thomas became unruly and refused medical attention, the...