(NewsNation) — Los Angeles socialite Rebecca Grossman was traveling as fast as 81 mph when she struck and killed two young brothers while racing her then-lover, prosecutors have argued as Grossman’s murder trial continues.

This week has provided a steady stream of testimony against the 60-old Grossman, who has been charged with two counts of murder and vehicular manslaughter and one count of hit-and-run in the deaths of 11-year-old Mark Iskander and his 8-year-old brother, Jacob. She allegedly hit the boys with her Mercedes SUV, which prosecutors say struck them while racing.

Grossman’s attorneys have not determined whether she will testify in her trial. The defense is attempting to raise doubt by suggesting Grossman’s lover at the time, ex-Major League pitcher Scott Erickson, was the one to strike the children.

A sheriff’s department expert on vehicle data recorders, also known as a vehicle’s black box, testified Friday. A sheriff’s deputy also testified during court proceedings as prosecutors have suggested that Grossman was traveling more than 80 mph when she struck the two boys, who were in the crosswalk of a residential neighborhood when hit.

On Thursday, an EMT worker testified Grossman complained about being at the hospital after the crash and commented that she would be home already had her airbag not deployed and disabled her car. A deputy also testified about clear front-end damage to Grossman’s vehicle and that Grossman said she remembered hitting something, “but she was not sure what.”

Grossman’s attorneys are expected to pin blame on Erickson, whose black SUV was never examined as part of the police investigation.