BOISE -- Boise Police investigators say they have made an arrest in connection the death of a patas monkey at Zoo Boise. A press conference is scheduled for 7 p.m. to release more details about the arrest.

Zoo Boise officials tells us the monkey was brutally beaten and left for dead early Saturday morning.

Police say they can't release many details as to how the intruders broke in or why. We do know that the monkey died of excessive blunt force trauma to his head and upper body.

On Monday, there was only one patas monkey inside the Primate House. Zoo Boise Executive Director Steve Burns tells us there had been two male patas monkeys inside the exhibit until Saturday.

That's when police tell us two intruders broke in and beat one of the monkeys to death.

Flowers stand just outside the exhibit where that monkey entertained so many over the years. Burns says, He was just a beautiful, beautiful animal, good size, two and half feet tall, 35 pounds, beautiful coloration.

Burns showed us where he found the animal, groaning and barely alive. It was about 20 yards form the enclosed exhibit where the monkey was kept.

Police tell us a security guard at the zoo spotted two intruders about 4:30 a.m. Saturday. They ran and were not found.

Both visitors and staff still can't believe one of the zoo's favorite animals is gone.

The staff and volunteers took it very hard on Saturday, there were tears and confusion, there was anger, disbelief, said Burns.

We asked whether the doors were locked or if there were any signs of forced entry into either the zoo or the exhibit, but police cannot release those details.

Meanwhile, Burns says they will be taking a closer look at their security.

We think our security is good, I've been here for 15 years, and we've never had something like this happen, of course, when it does you are going to use it as a chance to review everything you do, said Burns.

Police tell us the case is a top priority.

They believe the intruders left behind a gray ball cap with a skull-and-wings design on the right front.

If you have any information, call Crime Stoppers at 343-COPS.

As for the other patas monkey at the zoo, we're told he will not be able to live alone for long since monkeys are such social animals. The zoo is now looking to get another patas monkey for the exhibit, or else they will have to send the one they have to another location.

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