United Kingdom, April 22 -- Denise Richards has paid tribute to Patrick Muldoon, describing the late actor as her "best friend" and "voice of reason" following his death at the age of 57.

The actress, 55, shared a message on Instagram, two days after Patrick Muldoon's death, reflecting on their decades-long relationship.

She said on Tuesday (21.04.26): "I am deeply heartbroken and devastated losing you. You were my best friend and my family.

"We met in our first acting class, I was 19 never had an acting job and you were 21 a student at USC doing a recurring role on Who's the Boss.

"And here we are. 36 years later. My whole adult life and I don't know it without you."

She continued in her emotional Instagram post - which was accompan...