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Glen Coffee, according to our 49ers Rapid Reporter Michael Erler , missed Thursday afternoon practice and was a no-show for Friday morning's session as well.
The reason for Coffee's absence was unknown, until Friday afternoon (yes, it's the 13th) when the youngster out of Alabama announced his sudden and shocking retirement.
Matt Maiocco of Bay Area CSN first reported the news on Twitter, stating simply that "Coffee announces retirement" before following up with an update in which coach Mike Singletary apparently said that "Coffee's retirement decision came out of the blue."
That's understating it -- Coffee was born in 1987, which doesn't exactly put him in the same age bracket as Brett Favre, John Kasay, or any of the other elderly NFL players.
So, needless to say, this news is, as Erler put it, "shocking."
In fact, it was about a year ago that I was pretty excited to draft Coffee in fantasy football leagues -- if Frank Gore went down, it stood to reason that he could be a sleeper for any team's bench. Thinking that he's out of the league now is nothing short of mindboggling.
There's a distinct possibility that Coffee is dealing with some sort of personal (thinking emotional here, perhaps?) issues -- that's 100 percent speculation on my part, but if anyone has a better explanation for why a 23-year-old would simply up and retire from the game of football just before the season started, I'm all ears.

When former San Francisco 49ers running back Glen Coffee(notes) retired from the NFL this summer at the age of 23, he said it was because God told him to leave football and enter the ministry. He didn't mention whether or not he was supposed to accept his higher calling while carrying an automatic pistol.
Coffee was arrested in Florida on Friday morning for carrying a concealed firearm, according to TMZ. Police found the weapon cocked in his center console during a traffic stop.
The former NFL player had been pulled over for speeding in his 2008 Cadillac and was soon discovered to be driving a car without insurance or registration. When police searched the car before it was to be towed, they found the loaded weapon.
Police arrested Coffee and charged him with a third-degree felony, which is punishable in Florida by up to five years in jail. The arrest came in Coffee's hometown of Ft. Walton Beach.
In his rookie season with the 49ers, Coffee ran the ball 83 times for 226 yards and one touchdown. He was a third-round pick out of Alabama, where he made first-team All-SEC in his junior season.