A woman killed by her live-in boyfriend overnight is Sioux Falls' third homicide of the year.
Michael Richard Martinez, 28, is in custody on a $1 million dollar cash bond.
Martinez is charged with several counts in the stabbing death of his live-in-girlfriend. His victim was 21-year-old Beverly Guerra, a mother of two young children.
The crime has neighbors at a local apartment complex shaken up.
KSFY News spoke with one resident about the death of his neighbor.
It happened around 2:30 a.m. Thursday at the Willow Wood apartments in the 1600-block of South Rock Creek Drive.
Police say the couple had argued earlier in the evening, and that the alleged attacker is the one who made the call for help.
Afterwards, Martinez allegedly tried to perform CPR on Guerra.
Police tell us they're looking into any past history of domestic violence between the two.
Christopher Scarbo has lived at the Willow Wood apartments for nearly three years, but in that time, he's never seen anything like this.
"Every once and a while we get police officers coming around, I think just for minor disturbances, but this is the first big one that we've had in the last three years," Scarbo said.
Sioux Falls Police said 28-year-old michael martinez allegedly stabbed his live in girlfriend to death in their apartment.
"Considering I live just a block, just an apartment building next door, it's very scary," Scarbo said.
Sioux Falls Police Lieutenant Matt Burns said "during our follow up, a typical investigation, we're going to canvas those neighboring apartments and try to get that information to see what folks may have heard, seen, what their perceptions may have been at that time."
But neighbors aren't the only ones police say may have seen something.
"There were children present in the apartment. There were two minor children present in the apartment, apparently in a back room, and officers saw those upon arrival and tried to get them out as quickly as possible," Burns said.
The suspect's now in custody, and police say he's the one who called 9-1-1. Neighbors are glad they aren't in danger, but are still unsettled by the violent crime in their community.
"We got a newsletter about the incident and it kind of relieved us to know that the suspect is in custody, but it still kind of gives us worries about the safety of our children," Scarbo said.
If found guilty in the death of his girlfriend, Martinez could spend the rest of his life in prison.
He faces one count of murder in the the second degree and four counts of manslaughter in the first degree.