Fifty-one-year-old Dieuseul Jean was wanted in Canada for the alleged murder of his girlfriend in 1995.
Officials from Interpol's U.S. National Central Bureau in Washington announced Thursday that new investigative leads lead to Jean's March 22 arrest.
Jean faces murder charges in Montreal for the fatal stabbing of 42-year-old Juthlande Pierre of Roxboro, Canada.
Prosecutors say Jean stabbed Pierre more than 15 times and hid her body in a basement. She was found later after a friend reporting her missing.
Authorities say Jean fled Canada for Newark, N.J., where he allegedly lived under an alias.
Jean is in U.S. custody awaiting extradition. It's not clear if he has an attorney.