A third relative of transgender mass shooter Robert Dorgan has died nine days after the deranged dad shot up a Rhode Island high school hockey game, officials announced.

Gerald Dorgan, 75, the shooter’s ex-father-in-law, had been in critical condition since the Feb. 16 shooting that also claimed the lives of his daughter, Rhonda Dorgan, and grandson, Aidan Dorgan. His death was announced Wednesday.

“We are heartbroken to learn that another life has been lost as a result of last Monday’s senseless shooting at Lynch Arena,” Pawtucket Mayor Donald R. Grebien said in a statement.

“Our thoughts and prayers remain with the victim’s family, friends, and all those impacted by this tragic act of violence.”

Robert Dorgan, 56, deliberately targeted his family when he started shooting in the stands at the high school hockey game before taking his own life when tackled by hero onlookers.