. >> reporter: until a witness comes forward with a name -- dave shepherd, who soon confesses to the crime. >> he's laying on the floor, not moving, not breathing, nothing. i check his pulse in his neck. he's dead. >> reporter: shepherd has no known connection to dr. sonnier. but guess who he's best buddies with? dr. dixon. >> we just hit it off. >> reporter: it was an unlikely bromance. dixon, a successful plastic surgeon, and shepherd, a unsploimd -- unemployed con-man. >> he left his wife for her. you know, she broke up his marriage and he just wanted, i guess, payback. >> reporter: that meant getting rid of the man she loved. >> he wanted him hurt and then gradually developed into having him killed. >> reporter: based on shepherd's confession, police arrest dixon for ordering the hit on dr. sonnier. but who will the jury believe, a respected plastic surgeon, or a con-man? in the first trial, shepherd reneged, refusing to turn against his best friend. in the end, the jury couldn't reach a verdict. but at the second trial, one of the hitman's daughters takes the stand. he takes the