No. Tippit was not declared DOA at 1:15.
He was declared DOA at Methodist Hispital.
The document also states that the time of death was 1:15.
You're mistakenly mixing the two together.

The areas on Rose's document where the DOA is written and the actual time of death are in two completely unconnected different sections.
The document does say that Tippit arrived DOA and then the certificate also specifically says the actual time of death was 1:15.
For instance, if someone dies overnight and arrives at the hospital/morgue Dead On Arrival in the morning at 9AM, the time of death obviously isn't 9AM but the Doctor will base the actual time of death on a number of factors, of when he estimates that the actual time of death actually happened.


JohnM