(AP) — A 29-year-old Lincoln man is scheduled to be sentenced next month for robbery and two counts of witness tampering.

Online court records say Dustin Langenberg was convicted on Wednesday in Lancaster County District Court. He is scheduled to be sentenced on Nov. 20.

Authorities say Langenberg and two other men attacked a 33-year-old Lincoln man after the man’s estranged wife knocked on his door on Nov. 4, 2011. Authorities also say Langenberg tried to persuade his girlfriend not to testify against him regarding what he’d said before and after the robbery.

Two of the three other people involved in the robbery have been sentenced and the third awaits sentencing.