Massachusetts detective searched gunshot residue testing online 11 days before his wife is shot dead

When Massachusetts State Police detectives responded to a reported suicide in Westfield, Massachusetts, on May 8, 2018, they found Amy Fanion dead on her dining room floor with a gunshot wound to her head. Her husband, Brian Fanion, a Westfield Police detective, had called 911, reporting that Amy Fanion had shot herself.

At the scene, detectives made several discoveries that raised questions. The gun used in the shooting was Brian Fanion's service weapon. And there was a lack of gunshot residue on Amy's head, which was unusual in a self-inflicted gunshot wound. What had happened in that dining room that morning? "48 Hours" contributor Nikki Battiste takes a look at the evidence in "The Detective's Wife," an all-new "48 Hours" airing Saturday, May 4 at 10/9c on CBS and streaming on Paramount +.

Detective Brendan O'Toole took Brian Fanion to the State Police barracks in Russell, Massachusetts, to get his statement of the events surrounding his wife's sudden death. At the end of the interview,  O'Toole asked Fanion to turn over his phone for data extraction. Fanion complied but gave a caveat.