A prominent Princeton University theater director mysteriously died in an accident in the back yard of his Brooklyn home, authorities said Wednesday.

Tim Vasen, 51, of Fort Greene, was found unresponsive Monday by officers who were responding to a 911 call placed about 3 p.m., according to police.

The medical examiner’s office said he died as a result of “skeletal fractures with lacerations of spleen due to blunt impact.” No further information was provided by police, who said it was an accident.

School officials remembered the director as a “generous mentor.”

“All of us have lost one of the world’s finest teachers of theater,” said Michael Cadden, the chair of the Lewis Center for the Arts.

He went on to describe Vasen as “an intellectually voracious, physically vital and imaginative, daring practitioner of the art form.”

Vasen, who started as a faculty member at Princeton in 1993, taught countless theater graduates, including two-time Obie Award-winning playwright Branden Jacobs-Jenkins.