A 20-year-old Fort Worth man was killed Wednesday when part of a tree fell on him in the back yard of a home, police said.

Guadalupe Munoz was helping friends cut down a tree in the 1300 block of Parsons Lane when part of it fell on him about 7 p.m., according to police and the Tarrant County medical examiner.

Paramedics determined that Munoz had died shortly after their arrival, according to a news release from the Fort Worth Fire Department.

The top portion of the tree, approximately four feet in circumference and 14 feet tall, broke loose and struck Munoz in the chest, pinning him to the ground, the release said.

Firefighters used manual rams to lift the tree from Munoz's body, the release said.

His death was ruled an accident