SANTA CLARA -- Neither contract negotiations nor a Miami police investigation kept Colin Kaepernick from joining his 49ers teammates for Monday's start of the offseason training program.
Kaepernick is entering his fourth season and also the final year of his rookie contract. Talks on an extension reportedly have been tabled while Miami police finish investigating an incident where they were summoned to remove an unidentified woman from Kaepernick's apartment.
Players are not required to participate in the offseason program, aside from a three-day minicamp June 17-19.
Linebacker Aldon Smith, just over a week after getting arrested in Los Angeles on suspicion of making a false bomb threat, was among those present at Monday's workouts, Comcast SportsNet reported.
Not in attendance Monday was running back LaMichael James, who's training in his native Texas amid reports he might get traded.
Cornerback Chris Culliver, who's facing hit-and-run and weapon charges, was seen among those working out in a photo slideshow on the 49ers' website, as was linebacker NaVorro Bowman, who's recovering from knee surgery.
Offensive tackle Jonathan Martin, traded from the Miami Dolphins after his harassment there, enjoyed the first day of 49ers workouts. "Feels good to be back at it with my new teammates. Great first day," Martin tweeted.
Another newcomer happy with Day 1 was safety Antoine Bethea, who tweeted: "Good first day of work with my new band of brothers!!"
Linebacker Michael Wilhoite, Bowman's potential replacement for the start of the 49ers' season, was able to work out once he signed the one-year tender he received as an exclusive rights free agent. Bowman is recovering from surgery on the anterior cruciate ligament he tore in the NFC Championship game, and he's not expected back until midseason.
The 49ers would not confirm who else showed for the voluntary workout, and there was no media access Monday.