Lassiter is a 1984 American heist spy film starring Tom Selleck and Jane Seymour. The movie was made to cash in on Selleck's popularity as the character Thomas Magnum in the television show Magnum, P.I., but it failed to return its budget at the box-office on release. The Magnum, P.I. connection is perhaps most clearly seen by the movie poster tagline: The Magnum Man Hits the Big Screen with a Vengeance.

Thomas William Selleck is an American actor. His breakout role was playing private investigator Thomas Magnum in the television series Magnum, P.I. (1980–1988), for which he received five Emmy Award nominations for Outstanding Lead Actor in a Drama Series, winning in 1985. Since 2010, Selleck has co-starred as New York City Police Commissioner Frank Reagan in the series Blue Bloods. From 2005–2015, he portrayed troubled small-town police chief Jesse Stone in nine television films based on the Robert B. Parker novels.