After his guilty plea to a civil rights offense, what federal guideline range and ultimate sentence will Michael Slager face for killing Walter Scott?

As reported in this ABC News piece, "police officer Michael Slager pleaded guilty today to a federal civil rights offense in the shooting death of unarmed black man Walter Scott, bringing a conclusion to the case two years after the police shooting was caught on video by a bystander."  Here are more of the case processing basics: 

Slager pleading guilty to violating Scott's civil rights in federal court this afternoon will end the federal case against him and also resolve the state charges that were still pending after a mistrial was declared in the state murder trial last year. Slager's mother and Scott's mother both wept in court as the 35-year old former cop was led away in handcuffs.

Slager, dressed in a gray suit, said very little, answering "yes" to each of the judge's questions about whether he was aware of the various rights he was surrendering.  Slager's attorney, Andrew Savage, said in a statement before court, "We hope that Michael’s acceptance of responsibility will help the Scott family as they continue to grieve their loss."...

Slager, who is white, was accused of killing Scott, an unarmed black man, at a traffic stop on April 4, 2015, while Slager was an officer with North Charleston's police department.  Video that surfaced shortly after the encounter appears to show the moment Slager fatally shot Scott as he ran away. The video garnered national attention, propelling Slager into the spotlight.  He was fired from the force after the shooting.

Slager was charged in South Carolina with murder and pleaded not guilty.  The case ended in a mistrial in December 2016 and the retrial was expected to take place this year.  The federal trial had been expected to take place later this month.  The Justice Department said in a statement today that, according to documents filed in connection with the guilty plea, Slager "willfully used deadly force on Walter Scott even though it was objectively unreasonable under the circumstances."...

Slager has not yet been sentenced and the sentence is at the discretion of the judge, Wilson said. Slager faces a maximum sentence of life in prison for the federal civil rights violation as well as a potential $250,000 fine, the Department of Justice said.

For those thinking about the sentence that Slager can and will face, the plea agreement put together in the case foreshadows some of the likely guidelines action. Specifically, here is what Section 5 of the plea agreement says (with my emphasis added):

The parties request that the Court apply the United States Sentencing Guidelines (Guidelines) to calculate the applicable sentence and impose a sentence consistent with the Guidelines and 18 U.S.C. § 3553. The defendant agrees to waive all constitutional challenges to the validity of the Guidelines.  The defendant understands and acknowledges that the Court will find, by a preponderance of the evidence, the facts used to determine the offense level and, that in making its findings, the Court may consider any reliable evidence, including hearsay. Nothing in this section prevents the parties from filing objections to the Presentence Report prepared by the United States Probation Office, or from arguing the application of specific sections of the Guidelines.  The parties agree that the Court will determine the final Guideline range.  The parties understand that this Plea Agreement binds the parties only and does not bind the Court. The defendant understands that the government will advocate for the Court to apply the guidelines for Second Degree Murder and Obstruction of Justice, and reserves the right to seek a guidelines sentence, up to and including a sentence of life imprisonment.   The defendant reserves the right to advocate for any sentence he deems appropriate and the right to request a downward departure and/or downward variance.

Based on my understanding of this bolded sentence, it would appear the government will advocate for these basic guideline calculations: base level of 38 (for 2d degree murder) + 2 (for obstruction) - 3 (for acceptance of responsibility) = offense level of at least 37.  (I say "at least" 37 for the offense level because some victim-related or other chapter 3 enhancements might be deemed applicable, and the last part of this bolded sentence hints that the government may think other enhancements are applicable.) 

At offense level 37, Slager as a first offender would be looing at a guideline range of 210 to 262 month (17.5 to 21.8 years).  Arguably, the bolded language would preclude the government from seeking a departure or variance above whatever is determined to be the calculated guideline range.  And one can reasonably expect Slager and his defense team will seek a downward departure or variance, though what exact sentence the defense will seek is an interesting issue to watch as sentencing approaches.