In 1967, when the NHL expanded from six to twelve teams, Flett was drafted by the expansion Los Angeles Kings.

Flett was nicknamed "Cowboy" because in addition to being a hockey player, he owned a cattle ranch in Alberta and he was also a rodeo performer.

Not known for his playmaking skill or skating, Flett did possess a booming and heavy slapshot and when paired with the right center who could get him the puck, he was among the league's biggest scoring threats.

He was acquired along with Ross Lonsberry, Jean Potvin and Eddie Joyal by the Flyers from the Kings for Serge Bernier, Bill Lesuk and Jim Johnson on January 28, 1972.

[4] In May 1999, Flett entered the hospital due to a gallbladder condition which eventually contributed to liver failure.