Hundreds gathered on a softball field on Tuesday for a vigil to remember a star softball player and her mother, who were both stabbed to death in Rancho Penasquitos.Nearly 48 hours after the brutal stabbings of 18-year-old Briana Williams and her 52-year-old mother Donna Williams, for some people, the horror is finally starting to sink in.Many who attended Tuesday's vigil were overwhelmed with shock and sadness."It's still so hard to wrap my mind around it," said Briana's friend, Morgan Kurtz.Police said the beautiful star pitcher and her mother were stabbed to death in their home early Monday morning. Investigators said they were stabbed by Brian Williams, Donna's son and Briana's brother.Some at the vigil also grieved for Donna, a San Diego Police detective who often traveled with her daughter's softball team.It was on those trips that a friendship blossomed between Donna and fellow softball mom Cari Slater. Slater said Brian took his father's death in 2007 especially hard."He had depression problems," said Slater. "He loved his mother. He loved his sister. He was... just like that, a big teddy bear. I personally feel he didn't know what he was doing when he did this. This was a complete blackout situation."Dekanya Williams, another Williams sibling, attended Tuesday's vigil. Despite her unimaginable loss, she seemed to be consoling the group, giving them strength as they head into the softball national championships next week.Coach Don Portugal told 10News, "Bree would want us to play and give it 1,000 percent.""I'm just going to play for her because I know she's watching down on us," said Kurtz.Some players said they will draw strength from this double loss."That right there is enough motivation for me to do my best every single play," said teammate Angela Randazzo.The team hopes to dedicate a win to Briana and her mother.Brian will make his first court appearance on Wednesday afternoon.