Shanxi female teacher 17 years ago was killed and dumped at the bottom of the well. Why did her husband retract his confession after confession?

It's been 17 years since Shanxi female teachers dumped their bodies. Now my father is willing to offer a reward of 654.38+10,000 yuan for her pension, hoping that someone can help provide clues to find the real murderer. It was originally decided that her husband killed the case, and the husband of the female teacher also described the crime in detail. But after the body was found, the situation shown by the body did not match the part described by her husband. The medical examiner thinks the evidence is insufficient. The younger brother of the female teacher said that he had found the body and wanted it to do DNA identification, but he didn't do it. I can't help it, and then the case dragged on today. The husband of a female teacher has been tried many times. He said he didn't hurt his wife because the police made him confess. There are many doubts in this case. I think whether the body is a female teacher still needs to be certified. Maybe not at all, but it's just about the same. Why not do a DNA test? This is also a bit confusing. Then there is the confession process of the female teacher's husband, which seems correct, but there is a certain gap with the autopsy report, which may also be related to the environment at that time. In the past, the technology was not very developed, and many times some inspections may not be in place, which may lead to this situation. In fact, we can all understand what her father did. My daughter disappeared inexplicably and lost her life at a young age, which is a hurdle for every parent. Even a young old man who died unexpectedly may live between regret and pain all his life, not to mention his daughter's unexplained departure, and the truth of the matter could not be found in 17 years. If the problem has not been solved, the family members of female teachers will always live in confusion and will not be happy every day. I hope the relevant departments can give this family a clear explanation so that they can live clearly. Now, it seems that many old cases have been convicted because of insufficient evidence. For example, in the previous case of Zhang Yuhuan, he was sentenced to 27 years in prison and was acquitted this year. I hope that the relevant departments can't let go of any bad people and can't wronged anyone.