Foxborough police say the case against William E. Sheehan remains open, but on hold, until it’s clear whether criminal charges can be brought against the former teacher, swim coach, and Boy Scout leader accused of sexually abusing dozens of young boys over his two decades in town.

Sheehan, 74, now of Fort Myers, Fla., is in the late stages of Alzheimer’s disease and may be unable to defend himself, authorities say.