"Every time I used to see them, they were both very cheerful, " said Erath, who lives next door.

WSJ: Arrest made in death of NY boy, 4, found alone

Erath County Sheriff Tommy Bryant said Mr Routh then travelled to his sister's home, telling her what had happened before leaving.

BBC: Chris Kyle murder: War veteran Eddie Routh charged

So, on June 8 Anderson sent a press release claiming an extension on leases for oil and gas acreage in Erath County, Tex.

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Erath County Sheriff Tommy Bryant said Routh served in the Marines for four years, but it was unclear how much of that time, if any, was spent in combat zones.

CNN: STORY HIGHLIGHTS

Neighbor Eric Erath told reporters on Thursday that he used to see the little boy and his 6-year-old sister occasionally playing around the house, but he couldn't recall the last time.

WSJ: Arrest made in death of NY boy, 4, found alone

Erath County Sheriff Tommy Bryant said Kyle, 38, and a second man were found dead at Rough Creek Lodge's shooting range west of Glen Rose, according to the Fort Worth Star-Telegram and Stephenville Empire-Tribune.

NPR: Reports: Ex-SEAL/author Fatally Shot On Gun Range