New York-based company Spytech GPS is facing a products liability lawsuit over claims that their device facilitated the murders of two people last year.

Plaintiffs Melanie Williamson, John Michael Williamson Sr., and Desmond Theel are surviving family members and estate administrators for Sara Beck and John Michael Williamson. Beck, 22, and Williamson, 20, were fatally shot in Kansas last year by Beck’s ex-boyfriend, Dustin Johnson.