Hamilton Camp, 70, half of the folk-music duo Gibson and Camp whose 1961 album, "Live at the Gate of Horn," became one of the era's must-have records and who later found steady work as a character actor, died Oct. 2 at his home in Hancock Park, Calif. He had suffered a fall, but the exact cause of death has not been determined, a family member said.

When Albert Grossman, a Chicago manager, was trying to put together a folk trio, he introduced Bob Gibson to the singer-songwriter then known as Bob Camp. The pair decided they weren't interested in adding a female vocalist, so Grossman formed Peter, Paul and Mary instead.

"They got the opening night in the Garden, and we got the one-way ticket to Palookaville," Mr. Camp told the Los Angeles Times jokingly in 1987.

The pair worked folk clubs in New York and Chicago and became known for Gibson's 12-string guitar playing and their adventurous harmonies, which influenced the folk music scene.

Simon and Garfunkel recorded the pair's "You Can Tell the World," and Peter, Paul and Mary covered "Well, Well, Well."

After more than a year together and practically penniless, they broke up when Mr. Camp discovered improv and became one of the early members of Chicago's Second City troupe. He later joined the Committee, a satirical comedy group that produced Joan Rivers and Howard Hesseman.

A decade later, Mr. Camp and Gibson staged their first reunion show and performed together occasionally until Gibson's death in 1996.

Mr. Camp recorded several solo albums and wrote the song "Pride of Man," which Gordon Lightfoot recorded and the 1960s psychedelic band Quicksilver Messenger Service became known for performing. In all, Mr. Camp wrote 70 songs.

Eventually, he moved to Los Angeles to pursue acting and adopted the name Hamilton Camp.

An entire generation knew him as the voice of Smurfs on the long-running animated TV series rather than as a folk singer who embraced spontaneity. He appeared in more than 100 films and made-for-TV movies and dozens of TV shows.

The 5-foot-2 actor had memorable guest roles on three CBS shows. He was the manic salesman Del on "WKRP in Cincinnati"; the insane Boots Miller on "MASH"; and Mary's height-impaired date on "The Mary Tyler Moore Show."

"Short jokes are my life," Mr. Camp told The Washington Post in 1997. "It's like shooting fish in a barrel."

His last television role was as a carpenter on ABC's "Desperate Housewives."

Mr. Camp was born Oct. 30, 1934, in London. After World War II, he moved to Canada and then to Long Beach with his mother and sister, and the siblings performed in USO shows. In 1946, he made his first movie, "Bedlam," starring Boris Karloff.

On Broadway, he appeared in several productions, including "On a Clear Day You Can See Forever" in the 1960s and "Paul Sills' Story Theater" in the early 1970s. He also toured Europe and Canada in various productions and performed at theaters throughout Los Angeles.

He completed an album this year, "Sweet Joy," about the fragility of life and his love for his wife, Rasjadah Camp, who died in 2002 after 40 years of marriage. The album will be released in November.

Survivors include five children and 13 grandchildren.

Hamilton Camp, 70, was known as Bob Camp when he was a singer-songwriter in the folk duo Gibson and Camp. The group was best known for its record "Live at the Gate of Horn."