( CNN ) -- The Texas prosecutor shot to death in broad daylight outside a courthouse had feared for his life and carried a gun to work , according to a Dallas attorney describing herself as his friend . Colleen A. Dunbar told CNN that she spoke with Kaufman County Assistant District Attorney Mark Hasse on January 24 , and he told her he began carrying a gun in and out of the county courthouse on a daily basis . Hasse was gunned down in the parking lot while going to work Thursday . Investigators on Friday were reviewing his caseload for possible clues about what led to his killing . Dunbar described Hasse , whom she had known for 31 years , as a lifelong gun owner and firearms lover . `` He told me he would use a different exit every day because he was fearful for his life , '' she told CNN . She said that Hasse offered no specifics on why he felt threatened , but only that he did . Dunbar said she had shared her conversation with Hasse with law enforcement , and that she was `` shocked '' by the killing . When told of Dunbar 's statements , Chief Deputy Rodney Evans of the Kaufman County Sheriff 's Department was unaware of the information . `` But , '' Evans told CNN , `` we 've got 50 people here taking phone calls so somebody may know something I do n't . '' There were no significant advances in the case , Kaufman Police Chief Chris Aulbaugh said Friday , but that does n't mean investigators were n't busy . `` We 've fielded numerous tips coming in from the public . We are following up on every one of them , '' he said . Police say they believe one or two people committed the crime , but there are few descriptive details because they hid their faces . Police are looking for a gray or silver older model sedan in relation to the case , Aulbaugh said . Hasse was shot several times after `` a very small , very short confrontation , '' police said . Investigators are looking into whether Hasse 's killing was retribution for any of the prosecutions he led . Hasse was one of 13 prosecuting attorneys in Kaufman County , each of whom handled between 380 and 390 cases . Authorities hope that an ever-growing reward for information will reveal more leads . Donors in the area have raised $ 64,500 to be used as reward money , and the police chief has asked for more donations . The Texas Rangers , the FBI and agents from the Bureau of Alcohol , Tobacco , Firearms and Explosives have joined the manhunt . CNN 's David Fitzpatrick contributed to this report .
Slain Texas prosecutor began carrying a gun to work daily , friend says . Mark Hasse used a different courthouse exit every day , the attorney tells CNN . Prosecutor did n't explain why he was fearful , she says . Comment: