The letter's author identified several inmates who'd been bragging about their involvement in Brittany's killing. The tip was investigated, but the letter and the envelope it arrived in wouldn't undergo DNA analysis until April of 2019.
Then, last summer, the results allegedly revealed that only Kahl — who has been in prison since 2016, serving a six-year prison sentence following his seventh drunk driving conviction — could've licked that envelope. Subsequent testing on DNA evidence lifted from Brittany's clothing also returned a positive match for Kahl this February, firming up the case against him.
Kahl remains in custody, awaiting trial. A start date for those proceedings is being eyed for mid-2021.
On that horrific day Brittany was murdered, Jean Zimmermann says she missed a call from her daughter — one made minutes before authorities allege Kahl forced his way into her apartment.
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"It haunts me to this day," Jean confides. "I probably would've been on the phone with her when David Kahl broke in—there’s no doubt in my mind."
Jean says she has kept Brittany's legacy alive, in part, with an annual scholarship for students graduating from Marshfield High School and raising money in her daughter's name for the Marshfield Area Pet Shelter, which is building a new facility with a Free Roaming Cat Room named in Brittany's memory. "She may be gone but we will never let people forget who she was, and what she meant to us," says Jean.
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