Gul Ahmed Said is accused of shooting and killing the family of 10 in the Charsadda district of northern Pakistan on Sunday, district police Officer Shafiullah Khan said.
The quarrel stemmed from an argument over the amount of gold that would be offered for the daughter’s marriage, Khan said.
The daughter, whom the suspect wanted to marry, was also a cousin of the suspect.
Deputy Police Superintendent Tangi Rashid Marwat said Said apparently killed the family with the help of others.
Authorities are now searching for Said, who is also wanted for the November 2014 killings of his own parents, his brother and his sister-in-law.