susan hart was killed when an elevator malfunctioned, she was pinned between the floor and top of anranceway. now the man accused of contributing to the tragedy said he is haunted by her death. investigators have yet to determine the exact cause of the accident. trace gallagher is live in los angeles with more. hi trace. >> reporter: shan i don't know, the mechanic is michael hill. he's been working on elevators now for 38 years -- check that, 28 years, he says he still has no idea what the cause of this malfunction is. he actually got fired over this incident. susan hart was actually walking on to that elevator, in her midtown manhattan building when it malfunctioned and crushed her to death. his crew had just finished working on the elevator just a few hours before that. the city investigation points to something called a jumper wire as the cause, the wire that mechanics widely use it bypass the control panel and allows them to move the elevator whenever they want to. michael hill acknowledges yes, they did use a jumper wire to move the elevator but took that jumper wire off, and h