How a Family Road Trip Ended in the Deaths of a Toddler and Pet Dog

Kelly Sanders Brown, her daughter, Fiona, and their dog, Penelope, started an annual family vacation in the summer of 2025 that ended in tragedy.

Brown claimed that she locked her daughter and dog in their car while she disposed of litter. That quick errand stretched into hours of abandonment on a hot day that resulted in Fiona and Penelope's deaths. In the days leading up to the trip, Brown posted content on social media that her mother found disturbing, which raises the question: Was Brown not in her right state of mind, or was she criminally negligent?

Every year, the Brown family trekked from their Pennsylvania home to visit relatives in Maine. Brown, 3-year-old Fiona and their 13-year-old dog set off on July 30, 2025. Brown’s husband couldn’t take time off from work and stayed behind. According to the criminal complaint, they stopped at the home of Brown’s mother, Kristin Sanders, in Plymouth, Mass. From there, they drove to Sanders’ summer home in Clifton, Maine. 

On August 1, they headed to nearby Ambajejus Lake to stay with Brown’s grandmother. Per the complaint, the Brown family was supposed to return to the summer home on August 7, but Brown told her mother that they were camping along the Penobscot River. Her plan was to rest along various locations from August 7 to 9. Because the stops were filled with litter, Brown said she decided to teach Fiona a lesson about nature and picked up trash; the area around Freshies convenience store that flanked the river was especially filthy, so they dedicated more time there. 

Brown claimed they returned to Freshies the early cool morning of August 9; a collection of trash bags from the previous day’s whirlwind cleanup was piled up. Brown said she locked Fiona and Penelope in the Nissan Murano and set to toss the bags in a dumpster, but some garbage fell out. Brown claimed that she reached for it, slipped down an embankment and fell into the river. 

According to Brown, she struggled to swim out. She fought through a riptide and kept banging into rocks. After reaching the other side of the river, she caught her breath and headed back to the car. 

When she arrived, police and an ambulance were there. She told officers about falling into the river, but they noticed that her clothes were dry. Brown acknowledged that hours had passed. Once she learned that Fiona and Penelope were dead, she began to scream. 

Brown was arrested and indicted on charges of manslaughter, aggravated cruelty to animals and depraved-indifference murder. She pleaded guilty to the manslaughter and aggravated cruelty charges under an agreement that recommends certain terms, and she is scheduled to be sentenced on November 13, 2026, though the judge has deferred accepting her pleas until sentencing due to unanswered questions about what happened and the role Brown’s mental health played.

Although August 9 started off at about 60 degrees Fahrenheit, the temperature rose to a high of 82. Combined with the increased temperature inside a vehicle, and the results can be deadly. Certified consulting meterologist Jan Null tells A&E Crime + Investigation, “After an hour [in a closed car parked in full sun], the inside air temperature rises 40 to 45 degrees above the outside temperature.” Null co-wrote a study on vehicular heat strokes (though it did not measure Brown’s car) and found that kids are particularly vulnerable. 

“The problem, especially with infants and small children, is their bodies heat up much faster than an adult’s would,” Null says. “You can go into delirium, you can go into spasms. When the body temperature reaches 104 degrees, that’s a clinical definition for heat stroke. And that’s when you start having some of these symptoms. When the body reaches 107, that’s when cells inside organs begin dying and you get this cascade effect of organs shutting down.” 

In the days leading up to the trip, Sanders told authorities that Brown had been hallucinating, was hearing voices of what she said were shamans and seeing people who weren’t there. Brown had also engaged in out-of-character behavior on social media. On Facebook, she posted videos of her pantomiming to Katy Perry’s “Roar,” including an animated roar, and dancing to Gorillaz’s “Feel Good Inc.” as Penelope looked on. 

Brown’s defense attorney Jeffrey Silverstein said, "She was suffering from mental health issues that were clouding her judgement and perception, and distracted her on that day."

Clinical psychologist Sabrina Romanoff tells A&E Crime + Investigation, “Due to the context of the behavior in question in this situation, it could be likely that her attorney may request an evaluation to assess for competency.” 

Asked whether a mental health evaluation was performed, Silverstein responded to A&E Crime + Investigation via email saying that he “should wait” until after Brown’s sentence hearing to comment.

If Brown had pleaded not guilty, she may have encountered a sympathetic jury.

“In some situations, women can more easily see themselves in mothers on trial,” Romanoff says. “They understand the felt experience and can more easily extend empathy and compassion for mothers facing similar circumstances."

When police arrived on the scene, they found Fiona face down and hunched over the driver seat. Rigor and liver mortis had already set in, suggesting she had been in that position for a while. On the floorboard was Penelope, resting her tiny head at Fiona’s right foot.

Romanoff says that when “a mother violates the expectations we have around protecting her children and maintaining safety and security, the public tends to have strong negative reactions, often exacerbated by the violation of our expectations of the mother role.”

“Research suggests there is a big gender divide,” she says, “as women are more likely to be sympathetic towards mothers than men.”