Arlington, Texas was shocked with the stabbing death of Irasema Chavez in 2012. Irasema was stabbed 100 times, shocking residents who expected an arrest to happen sooner than later. However, even though investigators found a drop of blood on a TV stand that did not belong to Irasema, and surveillance video showed a possible suspect going into Irasema's apartment at 11:30pm the night before her body was found, no arrest was made and no suspect was named. Joseph Scott Morgan and Dave Mack examine the case and break down how investigators were finally able to match a blood drop found inside Irasema's apartment to Mayra Velasquez, a 42-year-old realtor and close friend of Irasema Chavez.

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