The TV actress is thought to have been gunned down after a domestic dispute.
The suspect, who had three wives before Reshma, allegedly stormed into the singer's house she shared with her brother in Nowshera Kalan, north Pakistan.
After a heated argument, he pulled out a gun and killed her, detectives allege.
Police said he managed to escape the scene of the crime before officers launched a murder investigation, The Times Of India reported.
Reshma was famous in Pakistan for her role in a drama called Zhobal Goluna.
She also released songs in her native language of Pashto.Source: