Police arrested Qandeel's brother Waseem from Dera Ghazi Khan late Saturday, reported the Dawn.
"She brought dishonour to the Baloch name" due to risque videos and statements that she posted on social media," said Waseem.
"There are other issues as well... Like the maulvi issue," he said, in a apparent reference to a recent controversy surrounding Qandeel's selfies with Mufti Qavi," added he.
"She wasn't aware I was killing her. I gave her a tablet and then strangled her," Waseem was quoted as saying during a press conference after his arrest.
The actor cum model was killed by her brother in the name of honour by her brother Muzaffarabad's Green Town area early Saturday.
The internet sensation had earlier claimed she was receiving death threats and had also sought security.