Ex-MLB star Milton Bradley is the suspect in a domestic violence investigation -- less than 2 years after he spent 15 months in jail for a previous incident.
TMZ Sports has learned ... cops were called to Bradley's L.A. home on Sunday where a woman told police the former MLB All-Star roughed her up during a heated argument.
39-year-old Bradley was not in the home when cops arrived. We're told the woman did not require medical attention.
Cops are investigating and are trying to get in touch with Bradley, asap.
Of course, Bradley has a well-documented history of domestic violence.