FILE - This booking photo provided by the Manchester Police Department shows Adam Montgomery, of Manchester, N.H., who was charged with murder in connection with the disappearance of his 5-year-old daughter. Montgomery has been convicted of unrelated gun charges. A jury found him guilty on Thursday, June 8, 2023, of six charges: two counts each of being an armed career criminal, receiving stolen property, and theft. (Manchester Police Department via AP, File)
FILE - This booking photo provided by the Manchester Police Department shows Adam Montgomery, of Manchester, N.H., who was charged with murder in connection with the disappearance of his 5-year-old daughter. Montgomery has been convicted of unrelated gun charges. A jury found him guilty on Thursday, June 8, 2023, of six charges: two counts each of being an armed career criminal, receiving stolen property, and theft. (Manchester Police Department via AP, File)

A New Hampshire father charged in the murder of his missing 5-year-old daughter Harmony Montgomery was convicted of unrelated gun charges Thursday.

A jury found Adam Montgomery, 33, guilty of six charges: two counts each of being an armed career criminal, receiving stolen property, and theft. The Hillsborough County jury got the case Wednesday afternoon after a trial in Superior Court that lasted several days.

Montgomery was accused of having a shotgun and a rifle, even though he has multiple felony convictions in New Hampshire and Massachusetts. He had pleaded not guilty. A sentencing date has not been set.

The prosecutionโ€™s witnesses included Kayla Montgomery, Adam Montgomeryโ€™s estranged wife, who testified he told her he took the guns. Kayla Montgomery is serving an 18-month prison sentence. She had pleaded guilty to charges that she lied to a grand jury about where she was working the day she last saw Harmony.

Lawyers for Adam Montgomery said the prosecutionโ€™s case relied on lies from other witnesses and that police reached the wrong conclusion. A message seeking comment was left with his main attorney.

Regarding Harmony, Adam Montgomery pleaded not guilty in October to second-degree murder, falsifying physical evidence and abuse of a corpse charges. Authorities allege that he killed Harmony by repeatedly striking her in the head with his fist. Heโ€™s scheduled for trial in that case in November.

Harmony hasnโ€™t been seen since 2019, but authorities didnโ€™t know she was missing until November 2021. Last year, police announced that they believed she was killed in Manchester in early December 2019.

Her remains have not been found.

โ€œThat part of the investigation has not stopped and will not stop until we find her,โ€ Benjamin Agati, senior assistant attorney general, told WMUR-TV.