Knife found in Hansen murder a major break in the case - KSFY News - Sioux Falls, SD News, Weather, Sports

Knife found in Hansen murder a major break in the case for Sioux Falls Police

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This week saw Sioux Falls second murder of the year.

The police department says it now has a tight case.

Thursday night, they found the murder weapon and they arrested a suspect within a half hour of the crime.

It was Wednesday afternoon when John Senn, 41, allegedly stabbed Brenda Hansen, 53, in her southwest Sioux Falls home.

Police caught up with Senn a short time later and arrested him, but they couldn't find the knife they believe he used until Thursday night.

Senn was taken into police custody and is being held on a one million dollar bond.

Police had asked for the public's help to find the murder weapon.

A detective found a knife and gloves in a dumpster at a nearby gas station. That's in the area between Hansen's house on West Misty Glen Place, where Senn is alleged to have killed her,  and the home he was staying at on South Theodore Avenue.

Finding the knife and gloves is a big break in this case.

Police will have those key pieces of evidence tested for DNA to see if there's any blood that belongs to the victim or the suspect.

Sioux Falls Police officer Sam Clemens said "I think there was probably a pretty solid case before that but it really just shores up a lot of loose ends, especially once the testing is done, if it in fact turns out to be his gloves and knife, as we believe, then it really eliminates a lot of possibilities as to what may have taken place."

Another key piece of evidence police found is Senn had Hansen's prescription of Oxycontin.

Police haven't determined if Hansen was stabbed for her pills or what other reason Senn would've had to kill her.

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