Christine Cavanaugh, an actress who voiced Rugrats‘ Chuckie and the title character in the film Babe, has died. She was 51.

Cavanaugh passed away on Dec. 22; the cause of death is unknown, TMZ.com reports.

She worked steadily throughout the 1990s and early 2000s, lending her voice to television series including The Critic, Darkwing Duck and Dexter’s Laboratory.

Cavanaugh also appeared in guest roles on The X-Files, Cheers and ER, among others.

Per an obituary in the Los Angeles Times, Cavanaugh retired from acting in 2001.

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