Seref C., a 50-year-old man currently suspected of murdering a garage owner in Valkenswaard, is also a suspect in a double homicide in Amsterdam's Slotermeer, Het Parool reports. C. is currently facing charges of murdering Valkenswaard garage owner 33-year-old Mahmud Karaman on December 30th, 2014. He gunned Karaman down through the window of a car, according to the judiciary. He is now in custody while the case is being investigated. But according to the Parool, this is not the only murder case C. is a suspect in. He is also suspected of stabbing a Turkish couple to death on Israel Queridostraat in Slotermeer on November 6th, 2013. He was identified as a suspect in April 2014, but was released shortly after his arrest. C was arrested again in February 2015.