Portrayed Dr. David Marcus, son of James T. Kirk and Dr. Carol Marcus, in two movies: Star Trek II: The Wrath of Khan and Star Trek III: The Search for Spock.

Following his appearance in STII he was a regular on the "Square Pegs" TV series.

Also appeared in the ST:TNG episode "Symbiosis".

Merritt passed away on March 17, 1989.