Two pedestrians were struck and killed by drivers in San Francisco over the weekend: a SF high school student was hit by the driver of a cab on Pine Street, the other killed while attempting to walk up a 101 off-ramp.

In the first collision, San Francisco Police officers were called to the area of Pine and Larkin Streets at around 10:30 Saturday night.

When they arrived, they discovered Seana Canavan, a senior at International High School, dead at the scene. She would have turned 18 today, the Chron reports.

A taxi cab traveling west on Pine Street struck Canavan when she "ran out into the street," according to the Ex.

Canavan had been out with a group of friends when she was struck, "sending her friends running to her aid while others cried out for someone to call an ambulance," the Chron reports. She died before first responders arrived, a police spokesperson says.

"Seana wasn’t just unique because of who she was, but because of what she was — a student, daughter, athlete, artist, comedian, feminist, San Franciscan, believer and my best friend,” her friend and classmate told the Chron.

The driver remained at the scene and is cooperating with the investigation, police say.

Then, on Sunday night, an as-yet unidentified pedestrian was killed as he or she tried to walk up the Alemany Boulevard off-ramp from 101.

According to KRON4, the California Highway Patrol got a call about a person walking up the off-ramp at 9:08 p.m. Moments later, they got another call saying that that person had been struck.

KRON4 reports that the person died at the scene. At publication time, CHP had not responded to SFist's request for additional information on the collision.