VIA: A lone gunman returned with a semi-automatic pistol to the Orlando awning factory where was fired in April and methodically killed five people on Monday, then killed himself at the sound of an approaching siren, the Orange County sheriff said.

Sheriff Jerry Demings identified the shooter as John Robert Neumann Jr., a 45-year-old Army veteran who lived alone and did not appear to be a member of any type of subversive or terrorist organization.

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The shooting began at about 8 a.m. after Neuman slipped through a rear door into the cavernous factory, an area that stretches across more than two football fields where awnings are stitched together for recreational vehicles.