( CNN ) -- The death certificate for Boston bombings suspect Tamerlan Tsarnaev , who died April 19 after a shootout with police , says he died of `` gunshot wounds of torso and extremities '' and `` blunt trauma to head and torso , '' according to the owner of the funeral parlor that currently holds Tsarnaev 's body . Peter Stefan , owner of Graham Putnam & Mahoney Funeral Parlors in Worcester , Massachusetts , read the death certificate to CNN over the phone Friday evening . He said it has yet to be filed with the city of Boston . There is no gravesite chosen yet for the 26-year-old Tsarnaev , Stefan said . He said that if he ca n't find a cemetery plot , he plans to ask the government to find a grave . `` Everyone deserves to be buried , '' Stefan said . Tsarnaev 's uncle , Ruslan Tsarni , claimed his nephew 's body , according to family spokeswoman Heda Saratova . The family plans an independent autopsy before burying the body somewhere in Massachusetts , she said . Stefan acknowledged plans for a second autopsy . Authorities say Tsarnaev and his younger brother , Dzhokhar , carried out the April 15 bombings at the Boston Marathon . The attacks killed three people and wounded more than 260 others . The brothers later killed a Massachusetts Institute of Technology police officer , authorities say . Dzhokhar Tsarnaev , 19 , is being held at a federal Bureau of Prisons medical facility in Devens , Massachusetts , charged with using a weapon of mass destruction , a charge that carries the death penalty . He is being treated for gunshot wounds to the head , neck , legs and hands that he received in the April 19 shootout with police that led to his brother 's death . Tamerlan Tsarnaev was shot in the gunbattle , and Dzhokhar apparently ran over his brother as he tried to flee in a car , authorities have said . It is not known whether the `` blunt trauma '' listed on Tamerlan Tsarnaev 's death certificate relates to injuries from the car . As part of their continuing investigation , investigators have found explosives residue in the apartment that the elder Tsarnaev shared with his wife and young daughter , a source briefed on the investigation said Friday . The residue turned up in at least three places at the apartment in Cambridge , Massachusetts , the source said : the kitchen table , the kitchen sink and the bathtub . U.S. law enforcement officials briefed on the progress of the investigation have provided CNN with other critical details : . -- Dzhokhar Tsarnaev told investigators that he and his brother built the devices in Tamerlan 's home ; . -- He said the brothers originally planned a suicide attack on the city 's massive Independence Day celebration , which draws about 500,000 people and is televised nationally on CBS ; . -- Dzhokhar Tsarnaev told investigators that the brothers chose to target the Boston Marathon only a day or two before the event . They changed their plans because their bombs were ready sooner than they expected . The officials spoke on background because they were not authorized to speak with the media . Katherine Russell , Tsarnaev 's widow , has remained largely out of view since her husband 's death , staying inside her parents ' Rhode Island home . Her attorney , Amato DeLuca , says the 24-year-old knew nothing about plans to bomb the race , and reports of her husband 's involvement came as an `` absolute shock '' to Russell and her family . Three of Dzhokhar Tsarnaev 's friends have been charged in connection with the case . Azamat Tazhayakov and Dias Kadyrbayev were charged Wednesday with conspiring to discard potentially incriminating items from Dzhokhar Tsarnaev 's dorm room . Robel Phillipos was charged with making false statements to investigators . The FBI is examining Dzhokhar Tsarnaev 's laptop , two federal law enforcement officials told CNN . Authorities have said they believe the brothers acted alone but are investigating whether they could have learned from or been aided by terror groups , including groups overseas . CNN 's Dave Alsup , Susan Candiotti , Carol Cratty , Marina Carver and Deborah Feyerick contributed to this report .
NEW : Funeral home releases details of brother 's death site . NEW : The funeral home 's owner says there is no gravesite yet . Source : Investigators find alcohol residue in three places at the suspects ' home . Source : Brothers planned a suicide attack on July 4 , the suspect told police .