I thought there was a rule that you had to be dead 10 years to appear on a stamp, but apparently they ditched that in 2011.

Well, at least I know that my time sense isn't so botched as all that. Trebek died in 2020. I didn't think it had been a decade yet.

More details and various media coverage when this was released about a year ago: https://www.stampsforever.com/stamps/alex-trebek