There are any number of reasons a player might miss his team's practice. Illness or family matters represent the most obvious reasons. Of course, it can also signal other things, business things, and it almost always fuels speculation. Wide receiver Danario Alexander is not at practice with the St. Louis Rams today. The reason for Alexander's absence is unknown.
An absent receiver is naturally going to fuel speculation for a team with a dozen guys competing for half that many spots. Occam's Razor for DX would naturally beg the question about his injury status, having a knee that's been operated on five times. With his injury history, he could be off having it looked at by Dr. Frankenstein. Stay tuned, and try not to let the speculation get the best of you. Alexander has been just okay in preseason play; not contributing on special teams hurts his status too.
The Rams made a move today, sending long-time long snapper Chris Massey packing. Massey has been with the team since 2002. The Rams have Jake McQuaide, a rookie from Ohio State, in camp doing some long snapping. This had to be a cap move; Massey was due $875,000 with a $500,000 roster bonus.
UPDATE: DX is not at practice because he's getting medical attention.