Police reports say Tekin and Parlak were partners in Doğuş Factoring and that the company's attorney was neo-nationalist lawyer Alparslan Aslan. Aslan was the hit man at the 2006 Council of State shooting. The reports also cite Tekin as the owner of the land Doğuş Factoring is located on.
Following the death of Yılmaz, his cousin, Parlak, succeeded him. A Doğuş Factoring partner, Ahmet Çekelkıran, went to the police in 2006 and filed a complaint against Parlak for threatening him if he didn't leave the company. Çekelkıran presented the police with several receipts of checks given to him and revealed Arslan's link to the company.
The police have also begun investigating Doğuş Factoring's monetary transfers made between 1999 and 2003. The police and prosecutor are in addition looking into accusations that the company is laundering some YTL 38 million in illegal earnings. Turkey's Financial Crimes Investigation Board (MASAK) and inspectors from the Finance Ministry have also begun scrutinizing the company's activities.
The Ergenekon organization was actively involved in drug trafficking to finance its activities, documents from the police previously confirmed, and Tekin was previously accused of managing drug trafficking through Doğuş Factoring and using the company to launder illegal earnings.