Free agent receiver Darrius Heyward-Bey spent the day at the Lions practice facility but left just before 4 p.m. without signing a contract. He told reporters he planned to go home and ponder his decision. He visited the Colts on Monday and hadn't scheduled any other visits. The Lions view Heyward-Bey as the speedy, field-stretching complement opposite All-Pro Calvin Johnson they hoped Titus Young would be. Heyward-Bey would certainly have the first shot at the No. 2 receiver spot since Nate Burleson and Ryan Broyles, both coming off surgeries, are best suited to play slot receiver.