Sean Halla, 26, reportedly shot his brother in the neck Sunday evening in the 3100 block of Sedgwick Circle in northwest Loveland after arguing about the price of a testosterone supplement.

According to the man’s arrest affidavit, Halla and his brother Jason Halla, 30, were arguing over a $30 price increase Jason Halla was trying to charge Sean Halla for the testosterone supplement. A Loveland Police Department press release said it was a controlled substance.

Jason Halla sold Sean Halla the same supplement for $180 a week and half prior to Sunday’s shooting, Sean Halla’s girlfriend Kristin Tate, 26, told police.

She said the argument began in the house and ended in the street near Sean Halla’s pickup truck. While the two men were arguing near the pickup truck, the affidavit stated, Sean Halla grabbed his handgun from inside the truck.

In an interview with police, the affidavit stated, Sean Halla said his brother punched him in the face during the argument. At that time Sean Halla fired his first shot into the ground.

Then, he fired a second shot that hit Jason Halla in the neck, which caused life-threatening injuries.

Jason Halla was taken to Medical Center of the Rockies for treatment of his injuries.

According to the hospital’s spokeswoman, Kelly Tracer, he was still in critical condition around 4 p.m. Monday.

Sean Halla was taken into custody without further incident and charged with first-degree assault.

He is being held at the Larimer County jail in Fort Collins on a $30,000 cash, property or surety bond, which can only be satisfied by putting up property he owns or paying $3,000 in cash out of his own pocket through the services of a bondsman.

He is scheduled to appear in court on Friday morning.

Dana Rieck: 970-635-3630, rieckd@reporter-herald.com or twitter.com/DanaRieckRH