Has Father Time caught up to Marcus Davis?

The former Ultimate Fighting Championship (UFC) welterweight and Ultimate Fighter (TUF) 2 veteran was knocked out in brutal fashion by Mark Casserley at the International Sport Karate Association (ISKA) "Worlds Collide" event on May 6, 2012 in Dublin, Ireland.

"The Irish Hand Grenade" apologizes to his fans via Facebook:

Sorry all.. I'm just not pulling the trigger like I did even 5 years ago. I have days in the gym where i cant be touched but days where I'm lethargic. Consistency is key to being a professional fighter. My reactions have slowed. I'm not going to make my decision now until I am with my family but this wouldn't have happened 10-5 years ago. Time I think has caught up with me. I will be with my wife tomorrow and we will discuss my career. From the bottom of my heart I thank everyone who has ever supported me... God bless

Prior to his loss overseas, Davis was 3-2 over his last five mixed martial arts (MMA) fights, having recently dropped a split decision loss to TUF veteran Chuck O'Neil at W-1 MMA 7: "Reloaded" last October in Florida.

See the lights go out at the 2:25 mark. Ouch.