The three-month strike at Butler Hospital that forced the closure of roughly half of the psychiatric hospital’s beds ended as workers voted “overwhelmingly” on Monday to ratify a new contract.

Butler Hospital and the Service Employees International Union 1199 New England announced the settlement Monday night in a joint statement.

“This contract ends the strike and, most importantly, ensures that caregivers can return to their patients,’’ the statement reads. “While this has been a long and challenging process, both sides worked hard throughout negotiations to reach this resolution.”

Butler Hospital is operated by Care New England, the state’s second-largest health system.

The four-year contract includes “immediate” wage increases of at least $3 an hour for every worker, and up to $5 a

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