The note left by the Missouri auditor's spokesman before his apparent suicide said "I just can't take being unemployed again."
Jefferson City Police Capt. Doug Shoemaker said Tuesday that the note from Spence Jackson was dated March 27.
Shoemaker also said Jackson died from a single gunshot wound to the head. Jackson was found dead Sunday in his Jefferson City apartment.
His death came about a month after Jackson's boss, state Auditor Tom Schweich, fatally shot himself at his home in the St. Louis suburb of Clayton.
Shoemaker read the full note at a news conference. It said: "I'm so sorry. I just can't take being unemployed again."
Police are investigating Jackson's death.