Okla. Stat. tit. 21, § 21-797: Degrees of robbery

Robbery in the first degree is when, in the course of committing

the theft, the defendant:

1. Inflicts serious bodily injury upon the person;

2. Threatens a person with immediate serious bodily injury;

3. Intentionally puts a person in fear of immediate serious

bodily injury; or

4. Commits or threatens to commit a felony upon the person.

When accomplished in any other manner, it is robbery in the

second degree.