Disclaimer: The following is just my opinion and for entertainment purposes:
In investigations that I've been a part of where burglary/vandalism resulted in a homicide, "burglary gone wrong", and where we haven't been able to immediately identify the perpetrator it does take a lot of time to get an arrest.
As most of you know it is a capital crime here in Texas to commit murder in the process of burglarizing an establishment. In these cases it takes anywhere from a week to a year before the perpetrator is arrested for burglarizing another establishment.
On a daily basis LE personnel assigned to investigate the capital crime is made aware of any and all arrests made where the original crime of burglary is made. If LE has a strong hit on a suspect, bond will try to be denied for a few days in order to verify certain evidence.
If the verification of evidence ranks high enough LE will work with the courts to set the bond amount very high so that the suspect stays incarcerated long enough for DNA, electronic, suspect relationships to others are established, etc. data to be analized.
Once LE is confident enough the case is presented to the DA.
If a suspect is incarcerated LE has time to get an 'air tight' case built....without regard to the public asking for answers. This process has been know to take several months. The most important factor for us is that a conviction is made.