A man faces capital murder charges after he "made sexual advances toward" and killed his grandmother in Old East Dallas, police say.
According to an arrest warrant affidavit, Michael Christopher Robinson went to his grandmother's house in the 4900 block of Terry Street on Friday.
Irish Harrison, Robinson's grandmother, tried to get away from him according to the affidavit, but he forced her to the ground and sexually assaulted her.
The document says Robinson then struck Harrison several times with a fire extinguisher.
A witness who arrived at the house late Saturday morning found Robinson, 32, in the living room with blood on his clothing and located Harrison, 71, dead in another room, the affidavit says.
Officers arrived and arrested Robinson, who waived his Miranda rights, according to the affidavit. During an interview, he admitted to sexually assaulting and killing Harrison and told police where to find the fire extinguisher.
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Robinson was being held in the Dallas County jail on a capital murder charge. His bail has been set at $1 million.