Federal investigators ruled out a link between the death of a man with cyanide in his blood and the deaths of two people killed by cyanide-laced Sudafed cold capsules.

Jack Durham, 30, of Everett, died Monday hours after telling hospital officials he had taken Sudafed.FBI spokesman Dick Thurston said Durham may have committed suicide. Everett police spokesman Mark Sigfrinius said Durham had suffered from depression and had attempted suicide recently.

Sudafed 12 Hour capsules were implicated in three poisonings in Washington last month, two of them fatal. The manufacturer, Burroughs Wellcome Co. of North Carolina, recalled the capsules nationally on March 3.