He appeared in a video released by an ISIS-linked news agency before he blew himself up on Easter Sunday.
Speaking with CNN on Saturday, she said she had her brother identify photographs of his body parts at the police station earlier this week.
"Five men were missing after the attacks (on Sunday), they were my three brothers, my father and my sister's husband," she said.
Friday night [1
0] alleged militants were stormed Civilians – including six children – were killed along with six alleged terrorists in the city of Sainthamaruthu on the east coast of Sri Lanka after a shootout between police and suspected fighters.
On Saturday morning, a gruesome scene was discovered in the raided house – bodies burned in three explosions and a roof were blown up.
CNN's James Griffiths and Susannah Cullinane contributed to this report.