I thought I had long-ago posted about the following (similar) story, but I can't find it. Here's the short version.
In 1996 or so, a Vietnamese coworker of mine was found shot dead in his car, in the parking lot of my workplace in Mass. The perpetrator was the brother-in-law (wife's brother), who worked at Hughes defense systems (who we later merged with) in El Segundo CA. He drove cross-country, shot my coworker through the windows while he was sitting in the car (gangland-style), then proceeded to drive all the way home to California. When investigators searched his home, they found the murder weapon, which he had kept with him for the entire ride home.