The 41-year-old star was reported missing by his parents after he missed a flight to Los Angeles from Vancouver.
Vancouver police confirmed a body was found in Stanley Park Thursday afternoon.
Koenig starred as Richard "Boner" Stabone on "Growing Pains" from 1985 to 1989. He also appeared on "21 Jump Street," "My Two Dads" and "Star Trek: Deep Space Nine." More recently, Koenig worked as an editor, writer and director.