Sister of Harshita Dahiya on 17 October accused her husband of killing the Haryanvi singer.
"Harshita was killed by my husband because she was a witness in my mother's murder case," Lata, sister of Dahiya
Meanwhile, Panipat District Superintendent of Police, Desh Raj said a team has been formed and investigation is underway in the matter.
"Postmortem is going on. We will slowly get to the bottom of it," Raj told ANI.
Dahiya, a local singer and dancer was shot dead on Tuesday by unknown assailants when she was leaving after a program in Panipat's Israna.
The assailants came in a car and fired five to six shots at her before fleeing away.
22-years-old Dahiya, a resident of Nahra-Nahri village of Haryana's Sonipat, was living in Narela of Delhi.
She was on way to her home at around 4:15 p.m. when the incident occurred.
She was accompanied by a male singer, her assistant and driver.
The body of the deceased singer has been sent to the mortuary at a general hospital.