MADISON, Wis. -- Police say they don't know why a Madison man allegedly shot and killed two of his stepsons.

Roger C. O'Neal, 42, of Madison, is being held in the Dane County Jail. The Dane County District Attorney's office says charges aren't expected today.

O'Neal is accused of killing two teenagers and holding police at bay with a rifle for 13 hours.

Police arrested O'Neal around 1:30 a.m. Tuesday when he surrendered after lengthy negotiations, and police fired tear gas into the home.

Madison police found one victim, Michael Gentry, 18, lying in the driveway of a home in the 2100 block of Taft Street with gunshot wounds shortly before noon Monday. He died shortly after. Police later found Lloyd Gentry, 15, dead inside the house.

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Watch Arrest Boys And Girls Club Locked Down South Side Fights Negative Stigma

During the stand off, area businesses were closed, including the Walgreens, Open Pantry and UW Clinic on Park Street.

O'Neal has been tentatively charged with two counts of first-degree intentional homicide.

The victims' mother had been in Chicago because her sister died of cancer on Sunday. The mother returned to find police surrounding her home. She was brought to the church in a state of shock.

Boys And Girls Club Locked Down

Right down the street from the shooting and standoff, the Boys and Girls Club went on lockdown shortly after noon.

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Carleen Wild Reports From Standoff Scene

After talking with police, the staff members decided it was best to make sure the kids were out of harm's way.

"Today was the first day, and it's crazy to have this happen on our very first day of camp," said Wyolanda Singleton, education and career director for the club.

The kids were forced to stay inside, and staff did what they could to keep the kids calm, occupied and informed.

"Give them all the information without getting them too scared, because they get as scared if they don't know ... then knowing too much," Singleton said.

Executive Director Juan Jose Lopez said the club is adamant about focusing on positive educational activities, although staff members realize these kids will come back with questions surrounding negativity.

"We'll probably have to do and have discussion when the kids come back because I'm sure that's going to be the talk of the neighborhood," Lopez said.

The staff told News 3 they are confident the neighborhood and these kids will only leap forward.

Lopez said events like the shooting and standoff affects the entire community, but won't hold them down.

"It's a temporary bad mark, but we'll work through it and then we'll come out ahead and continue to educate the community of the good things that are going on in south Madison," Lopez said.

South Side Residents Fight Bad Rep

For years, south side residents have been fighting the reputation that their neighborhood is a violent place, and many say that's among the reasons this tragedy hits so hard.

Historically, the neighborhood has been a diverse place filled with modest homes and hard-working people.

Yet, a lot of the focus over the years is on violence, which occasionally has been deadly.

"We had one on the corner here a few years back and stuff like this here makes the neighborhood a little scary," said Edward Hillman (pictured, left), a longtime resident. "People don't want to come to it, and we've been trying to bring the neighborhood back to what it was, and this happened and it's going to tear it down again."