As if this case didn’t have enough mystery attached to it.

A Dallas County grand jury today indicted a former police officer of murder in the shooting death of a man who was gunned down in his own apartment.

Former Dallas Police Department officer Amber Guyger walked into Botham Jean’s apartment earlier this year and allegedly shot him to death. She said at the time she mistakenly entered his residence, thinking it was her own.

OK. My first reaction was . . . huh? The apartments are on separate floors.

It didn’t take DPD long to fire Guyger after the Sept. 6 shooting. There were protests in Dallas over Jean’s death. Incidentally, Guyger is white; Jean, a native of St. Lucia, was a black man. The racial element of this crime hasn’t risen to the forefront of the community debate. It might eventually.

It gets even weirder.

The Texas Rangers, the crack investigative arm of the Department of Public Safety, charged Guyger with manslaughter. The case then went to the grand jury, which decided today to level the more serious charge of murder against the former officer.

Botham Jean has been described as an upstanding young man, active in his church, a fine individual. I don’t know much about Guyger, about what kind of an officer she was.

What strikes me as strange is that the grand jury, after hearing the evidence and the criminal complaint delivered by the district attorney’s office, would elevate the charge. Manslaughter implies a crime that was committed without intent to take someone’s life; a murder charges alleges that someone intended to take another person’s life.

This case is full of unconnected dots. Some more of them might have emerged with this indictment. I have two related questions: Did Amber Guyger know Botham Jean and was there a reason other than it being a simple mistake that she allegedly entered his apartment and then shot him to death?

The trial will tell us.

This story saddens me terribly.