Updated at 10 a.m.
ANNAPOLIS, MD — Stanley Synowczynski, the 75-year-old man hospitalized after an explosion collapsed his Annapolis home, died late Thursday.
The Anne Arundel County Fire Department confirmed his death in a Friday announcement.
"This is a tragic incident and our hearts go out to the family and friends of the Synowczynskis," reads the department's release.
It marks the second death tied to the Aug. 19 explosion. Synowczynski's wife, Linda, was pronounced dead at the scene after she went into cardiac arrest.
Related: 1 Person Dead, Another Injured After House Collapses In Annapolis
The latest update comes after authorities confirmed the explosion was accidental.
Investigators earlier determined the explosion was caused by a severed propane line and a metal grinder used by one of the homeowners who was working around the home's HVAC system.
The grinder acted as an ignitor as propane gas built up inside the residence.
Related: Annapolis House Explosion Caused By Severed Propane Line, Metal Grinder
Family members told investigators that the gases likely went undetected due to a "diminished sense of smell" experienced by one of the homeowners.
First responders received their first calls about the incident on the 1100 block of Green Holly Drive in Annapolis on Aug. 19, shortly before 12:30 p.m.
At the Cape St. Claire site, officials found a collapsed home, a debris field that stretched out to more than half a block, and neighbors who stepped in to help the Synowczynskis.
Brothers Joseph and Benjamin Toms were among the first neighbors on the scene and helped pull Linda from under debris.
After going into cardiac arrest, emergency personnel on the scene pronounced her dead. Stan was subsequently helicoptered to the Johns Hopkins Bayview Medical Center in Baltimore in critical condition.
Larry Schultz, assistant fire chief of the Anne Arundel County Fire Department, said a neighbor had been treated for exhaustion and that one police officer injured their leg while examining the scene.
Over 50 firefighters from across the region responded to the incident. Resources were pulled from as far away as Washington, D.C.
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