I am sorry to hear of the tragedy. After 25 years in law enforcement together with many years practicing law, I assure you family members do not need to see pictures of their loved ones in that type of situation and it will not bring you closure.
If the investigation is closed, you need to start by making a public records request for the police report. In Texas they do not need to give you the full report, only the initial report, so you may not get the detectives report.
If that public records request does not yield what you want, I am afraid that a local attorney is not going to be able to get the report for you unless there is some type of law suit filed and it is obtained by subpoena
and it really does not matter who the attorney is, because if the police release a report even to an attorney that is not to be disclosed, the officer will lose their job. The best you may get is the ability to speak with the investigating detective on the phone at that point
However, if the department denies your public records request, then you can spend the money on a local attorney to file suit in court for the violations of the Texas Public Records Act.
You can get an attorney if you ultimately need one (you may get all you need through public records) at the same sites used by other attorneys, http://www.lexmundi.com or http://www.hg.org.