SAN FRANCISCO - Family and friends of Colden Kimber of San Francisco, the man who was stabbed and killed over the weekend at a Muni stop, are struggling to make sense of what happened.

What they're saying:

They say they're experiencing a roller coaster of emotions.

Lara Litchfield-Kimber describes her son as being highly intelligent.

The 28-year-old was a college student, an athlete and a skilled bicycle mechanic.

Inside American Cyclery, a bicycle shop on Frederick Street in San Francisco, there is a void.

The work space where Kimber repaired bicycles now sits empty.

"There's been a lot of tears. There's been a lot of rage and just anger as to how something so senseless could happen." said Bradley Woehl, owner of American Cyclery.

What Happened:

Video from the Citizen app shows

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