I'd think you're right, and the wounds were compared to knives in the apartment, assuming the weapon was a knife.
I thought of another possible scenario. Suppose she told the truth about washing her uniform. Did she have to use a laundry room in the complex? Could she have met up with the suspect in there? Did she recognize him because he was a neighbor? So after standing around the hot w/d's for awhile, they go to her apt to wait. Which raises another question, was her uniform found in her apartment? Clean, or dirty?
ETA: One more thought. There's a picture of Carmen with blonde hair. I can't get to it at the moment (on my phone), but it looks as though she's sitting near a swimming pool. I wonder if that was taken at the same complex, or if not, did her complex have a swimming pool. And if so, was it customary for tenants to socialize in the evenings around the pool. I have a hunch this guy either was a tenant, or a friend of a tenant -- part of a secondary circle of friends, as indicated in the article.