wendi started dating a fellow fsu professor named jeffrey lacasse. and dan also found a new legal eagle to be his romantic co-counsel, a prominent new york law professor. >> and i said, "you have a girlfriend now, you're having fun in life again, you're smiling a lot. you have to start celebrating those things and walk away from this negativity." and he walked away from that conversation saying, "you're right." >> reporter: but on july 18th, right after his morning workout on that beautiful summer day, he'll be shot down in his driveway. his next door neighbor calling 911. >> his driver's side window is shattered and he's spattered and can't answer. he's inside the car that's running, and he has blood all over his head. he is not responding to me. >> reporter: when we come back, markel's ex-wife is the first person police bring in. she's all tears -- >> oh, my god! >> reporter: -- and fears. >> so i understand why i would be the person you would think would do something. >> reporter: when "20/20" has crazy low prices. do you know how we do it? - how?