The 49ers fell so hard for Reuben Foster that they celebrated wildly when they stopped his fall in the draft.

In April, their draft room exploded after they made the Alabama linebacker the penultimate pick in the first round. Why?

Moments after selecting the Butkus Award winner, general manager John Lynch told reporters the No. 31 pick was ranked No. 3 on the team’s draft board and it was “very likely” they would have selected him 28 spots earlier if their first selection, Stanford defensive lineman Solomon Thomas, wasn’t available.

“We got two of our top three players,” Lynch said. “… We’re thrilled. We’re ecstatic. We think these guys have traits that encompass what we want to be about as a football organization.”

Ten months later, it’s not clear if Foster will be with the 49ers’ organization much longer after exhibiting traits that scared other teams off in the draft. On Sunday morning, a month after he was arrested for misdemeanor marijuana possession in Alabama, Foster was arrested on charges of domestic violence, threats and possession of an assault weapon.

On Monday, the San Jose Mercury News reported the alleged victim, Foster’s longtime girlfriend, told police Foster physically dragged her during an argument at a home in Los Gatos. Foster allegedly threw her belongings onto a front walkway and balcony during the argument, according to the report.