A medical examiner said her hypothermia and drowning death was accidental and involved drug intoxication, according to an autopsy report also released Tuesday.
Before she disappeared on January 15, Anderson was pulled over by an officer in North Kansas City, Missouri - a separate jurisdiction from Kansas City - around 4:30 a.m. after an illegal lane change. Friends say Anderson left work early on Sunday, January 15 from a local club and had planned to meet a friend. The officer told her to go park and collect herself. She later drove into the Missouri River and died.
Police Maj. Kevin Freeman said the officer's actions were "reasonable given the information provided to him at the time of the stop", although he acknowledged questions had been raised about why she wasn't arrested.
Anderson's body was found two months later.
Toni studied marketing at the University of Missouri-Kansas City and, in her spare time, reviewed music festivals, her family said.
A cop had stopped the 20-year-old and ordered her to park up and'collect herself but had not made Anderson take a sobriety test
But a friend of Anderson is demanding justice, and says that if the officer suspected in any way that she was drunk or high on drugs, then he should have ordered a sobriety test. The vehicle was in drive with the keys in the ignition. That was the last anyone heard from her. 'No, they are going to perform a Breathalyzer test or other DUI testing and then determine if they need to take you in or not'.
"He should be punished for the fullest extent for letting her go", Gillespie said.
Anderson's mother, Liz Anderson, has said she believes Anderson's death was an accident. On Tuesday, Anderson would not comment.
The investigation is now closed, police said.