A 25-year-old man faces murder charges after allegedly fatally stabbing a woman in a serene South Florida neighborhood, as reported by the Martin County Sheriff’s Office.

The suspect, Kersten Francilus, who resides in a nearby area, is accused of attacking a woman in her 70s while she was out walking her dog on Friday in Stuart’s Southwood neighborhood, according to Sheriff John Budensiek.

Prior to the incident, residents had alerted deputies about a suspicious person who was going door-to-door, posing odd questions.

“We received several reports from the Southwood community, a typically quiet and upscale area in Martin County, about a suspicious individual approaching homes and engaging with residents,” Budensiek shared during a news briefing.

“This man repeatedly asked various people about the location of a new bank, despite there being no bank nearby,” he added.

During these interactions, witnesses reported that the man appeared calm and did not act confrontational, the sheriff noted.

A short time later, authorities received additional calls reporting that the same man was attacking a woman in a cul-de-sac.

A deputy who was already en route to investigate the suspicious activity arrived to find the suspect “actively stabbing” the victim while she lay on the ground, Budensiek said.

“Our suspect was on top of her, actually actively stabbing her,” he said.

A brave Good Samaritan attempted to intervene but was unable to stop the attack before deputies arrived, officials said.

When confronted by the deputy, Francilus immediately dropped the knife and surrendered.

The victim suffered stab wounds to the upper torso and was transported to Cleveland Clinic Martin South, where she died, authorities said.

“This was a violent, vile homicide,” Budensiek said.

Police said there is no known connection between Francilus and the victim, and no clear motive has been identified.

“At this point, this appears like an extremely violent, random act of violence,” Budensiek said.

Francilus was taken into custody at the scene and later booked into the Martin County Jail. Authorities said the knife used in the attack was a steak knife believed to have come from his home.

The sheriff’s office said Francilus has no known criminal history, though deputies had previously responded to a call involving him acting strangely at his residence.

Budensiek said residents were wise to report the man’s peculiar behavior.

“The community did what they needed to do. They saw something that wasn’t right. They called the Martin County Sheriff’s Office,” he said.

Authorities have not released the victim’s name.