Linq to SQL - Get Related Data

I've got some data that I need to return some of its related data and put it all in a model. I have all the appropriate fields setup in my model, and looks like this:

public class ComputerModel
{
    public int MachineId { get; set; }
    public int GroupId { get; set; }
    public int SoftwareVersionId { get; set; }
    public string GroupName { get; set; }
    public string SoftwareVersion { get; set; }
    public string IPAddress { get; set; }
    public string HostName { get; set; }
    public string MACAddress { get; set; }
    public string Title { get; set; }
    public bool IsIGMonitor { get; set; }
    public string UpTime { get; set; }
    public DateTime DateEntered { get; set; }
    public string EnteredBy { get; set; }
    public Nullable<DateTime> DateUpdated { get; set; }
    public string UpdatedBy { get; set; }
    public ICollection<MachineRole> MachineRoles { get; set; }
    public ICollection<Role> Roles { get; set; }
}

Here's the linq statement I'm trying to use:

var query = (from m in unitOfWork.Context.Machines
            join u in unitOfWork.Context.Users
            on m.EnteredBy equals u.UserId into EntByUser
            from EnteredByUser in EntByUser.DefaultIfEmpty()
            join u2 in unitOfWork.Context.Users
            on m.UpdatedBy equals u2.UserId into UpdByUser
            from UpdatedByUser in UpdByUser.DefaultIfEmpty()
            join g in unitOfWork.Context.Groups
            on m.GroupId equals g.GroupId into Grp
            from Groups in Grp.DefaultIfEmpty()
            join s in unitOfWork.Context.SoftwareVersions
            on m.SoftwareVersionId equals s.SoftwareVersionId into SW
            from SoftwareVersions in SW.DefaultIfEmpty()
            join mr in unitOfWork.Context.MachineRoles
            on m.MachineId equals mr.MachineId into MachRoles
            from MachineRoles in MachRoles.DefaultIfEmpty()
            join r in unitOfWork.Context.Roles
            on MachineRoles.RoleId equals r.RoleId into Rolz
            from Rolz2 in Rolz.DefaultIfEmpty()
            select new ComputerModel()
            {
                MachineId = m.MachineId,
                GroupId = m.GroupId,
                SoftwareVersionId = m.SoftwareVersionId,
                GroupName = Groups.GroupName,
                SoftwareVersion = SoftwareVersions.Version,
                IPAddress = m.IPAddress,
                HostName = m.HostName,
                MACAddress = m.MACAddress,
                Title = m.Title,
                IsIGMonitor = m.IsIGMonitor,
                UpTime = m.UpTime,
                DateEntered = m.DateEntered,
                DateUpdated = m.DateUpdated,
                EnteredBy = EnteredByUser.FirstName + " " + EnteredByUser.LastName,
                UpdatedBy = UpdatedByUser.FirstName + " " + UpdatedByUser.LastName,
                MachineRoles = m.MachineRoles,
                Roles = ?????
            }).ToList();

I can get MachineRoles to populate but I cannot get Roles to populate. I've tried Roles = Rolz2 but Rolz returns a single instance of Role, not a collection.

How can I get this query to return Machines and the related data for both MachineRoles and Roles?

I've looked at the following articles but haven't had much luck:
This SO Article
Loading Related Data - MSDN
Using Include with Entity Framework

UPDATE
I notice if I remove my model and use an anonymous type, then I don't get any errors:

select new ()
{
    GroupName = Groups.GroupName,
    ......
}).ToList();

But this doesn't help me in my project because I need to use a Model for the data.