The shooter in a horrific Bronx triple-murder-suicide had been in and out of prison for decades on gun and drug charges — and was just hours away from having his most recent weapon case dismissed in court when he died, the Daily News has learned.

After killing the three victims, Kaseem Stukes, 44, was caught on a NYCHA surveillance video stepping out of the family’s apartment in the Castle Hill Houses about 8:15 a.m. Wednesday to leave a chilling voicemail for his 20-year-old son in North Carolina.

“Check on your family,” he told his son before stepping back in the apartment on Lacombe Ave. near Castle Hill Ave. and fatally shooting himself, police sources said.

The son reached out to the mother of one of Stukes’ children, who called friends, asking them to check on the apartment.

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