Fiancee of suspect in ex-state senator's murder speaks out

Tim Loggains told ABC News that he and his fiance, Becky Lynn O'Donnell, have no idea why she was arrested for the murder of her friend Linda Collins-Smith.
4:44 | 06/26/19

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Transcript for Fiancee of suspect in ex-state senator's murder speaks out
We go now to that ABC news exclusive and the mystery surrounding the death of former Arkansas -- of a former Arkansas state senator. Her friend is now in custody facing charges but that friend's fiance says there's no way that she is guilty. T.J. Holmes sat down with him. T.J., what a story this is. Yeah, good morning to you all. You're about to hear the fiance right now unequivocally stand by his woman who this morning still sits in jail and she is accused of being a killer but the fiance is accusing police of having blinders on and he says his only recourse now is to ask the country for prayers and police for the evidence. A shocking mystery that turned heads. News of Arkansas police investigating a cold-blooded killing of a former state senator Linda collins-smith who was found shot to death and wrapped in a blanket outside her home on June 4th. Police remained tight-lipped for days but later they say they found the suspect, friend and former colleague Becky Lynn o'donnell now facing charges of capital murder, abuse of collins-smith's body and tampering with physical evidence. She is sad that this is hurting her family. But she's angry and she's strong. Who is she mad at? Whoever arrested her and why. Reporter: O'donnell is spending a second week in jail and her fiance Tim Loggains claims police have made a huge and inexplicable error. She has been arrested now for capital murder and you and Becky don't have any idea why? None whatsoever. Reporter: Loggains says he was the one to break the news to o'donnell. I just told her they found Linda dead and she collapsed. Reporter: Police records were sealed and authorities haven't said much about the case but more than a week after the murder o'donnell and Loggains were on their way to the memorial service for collins-smith when they noticed flashing lights. What did you think was happening when you saw those blue lights? I mean, I don't know what's going on but it's obvious they're stopping us with my son in the truck and we stop and they've got ar-15s pointed at us. You could see the look of utter disbelief on her face that that was happening. Not knowing what is going on. Reporter: O'donnell worked on collins-smith's most recent campaign and was the last person to have seen collins-smith alive. I believe it was may 28th. She took Linda to lunch is what she told me. Took her to lunch to her home. Yes. They were very close -- you don't understand. Becky worked for Linda but Linda was a family friend. It was like Becky's sister. Linda was like my sister. You would classify them as best friends. Yes. Reporter: O'donnell was a corroborating witness in collins-smith's divorce and he had power of attorney over collins-smith overseeing some of her financial matters and that has brought him under some public scrutiny. I didn't want to do it. But Linda needed the help and you help a friend when they need it. I never made a nickel off helping Linda do any of that, period. You're telling me you never benefited from any of that. Never. Not a nickel. Are you 100% certain that your fiancee, Becky, had nothing to do with the murder of Linda Collins? Yes, I am. You had nothing to do with the murder of Linda Collins? I did not. Reporter: After o'donnell's arrest collins-smith's family was stunned releasing a statement saying we are sickened and upset that someone so close to Linda would be involved in such a terrible, heartless crime. But Loggains is asking for help to clear his fiancee's name saying he believes the real killer is still out there. Has it crossed your mind for a moment just in some late night alone where you questioned, well, maybe Becky is capable of this. Becky is not capable of this. I never questioned that at all. Never? No. I mean either she is a best actress in the world and a sociopath and completely fooled me or there's not a chance she did this. Well, the next court date is scheduled for next month in July. Still, police are saying they had a critical juncture in the investigation and sealed the documents and aren't saying much of anything but everyone you talk to there that knew these folks and know them well talk about how tight knit this group was and you hear him and something just isn't adding up and making sense and there is no one suggested a motive of any kind for this killing. He is adamant. Absolutely is. Not guilty. All right, thank you, T.J.

This transcript has been automatically generated and may not be 100% accurate.

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