Henry McCullough, a guitarist who played with Paul McCartney’s post-Beatles band Wings, was in critical condition Thursday at a hospital in Northern Ireland after suffering a heart attack, a publicist who has worked with him told CNN.

The publicist, Anne Leighton, cited McCullough’s longtime girlfriend, and said the family has asked for privacy. Leighton said she believed the heart attack happened earlier in the week.

A spokeswoman for Causeway Hospital in Coleraine, Northern Ireland, confirmed that McCullough, 69, was in critical condition at the hospital, but she made no mention of a heart attack.

“He is currently being monitored closely by doctors,” spokeswoman Donna Lemon said.

Born in Portstewart, Northern Ireland, McCullough’s music career included playing with Joe Cocker’s Grease Band before joining Wings in the early 1970s. McCullough also made his way onto the Pink Floyd "Dark Side of the Moon," according to his web site, with his spoken voice in a brief dialogue segment.

An injury to his hand stalled his career in the 1980s, but by the end of the decade he had formed a band and began touring again.