A Massachusetts judge ruled that defrocked Roman Catholic Cardinal Theodore McCarrick is not competent to stand trial in a sex abuse case.

He was charged with sexually assaulting a teenage boy in Massachusetts decades ago.

Dedham District Court Judge Paul McCallum dismissed the case against McCarrick in a Wednesday hearing.

Cardinal Theodore Edgar McCarrick speaks during a memorial service in South Bend, Ind., March 4, 2015. Robert Franklin/South Bend Tribune via AP, FILE

MORE: Former US Cardinal Theodore McCarrick defrocked by Vatican over sex abuse claims

Dr. Kerry Nelligan, a forensic psychologist, testified that McCarrick has dementia and suffers significant cognitive deficits.

Nelligan said McCarrick had an "inability to learn and retain information."

This is a developing story. Please check back for updates.

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